This standard applies to mechanical seals for rotating shafts. GB 5894-1986 Mechanical seal terminology GB5894-1986 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Terms of Mechanical Seals
The terms of mechanical sealiThis standard applies to mechanical seals for rotating shafts. 1 Mechanical seals and their classification terms
1.1 Mechanical seal (face seal)
mechanical seal (face seal)UDC 621.6-762
GB5894—86
A device to prevent fluid leakage by keeping the end faces perpendicular to the axis of rotation in contact and relatively moving under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of auxiliary seals. 1.2 Hydrodynamic mechanical seal
Hydrodynamic mechanical sealA mechanical seal whose sealing end face is designed with a special geometric shape and generates a fluid dynamic pressure effect by relative rotation. 1.3 Tangential acting hydrodynamic mechanical sealA hydrodynamic mechanical seal that can form a fluid dynamic pressure distribution in the tangential direction. 1.4 Radial acting hydrodynamic mechanical seal (active acting hydradynamic mechanical seal) A hydrodynamic mechanical seal that can form a hydrodynamic distribution in the radial direction to resist leakage. 1.5 Hydrostatic mechanical seal
Hydrostatic mechanical seal
A mechanical seal whose sealing end face is designed with a special geometric shape, and which uses the pressure drop of the pressure fluid introduced from the outside or the sealed medium itself through the sealing interface to produce a hydrostatic effect. 1.6 External pressurized hydrostatic mechanical seal
Side pressurized hydrostatic mechanical seal A hydrostatic mechanical seal that introduces pressurized fluid from the outside. 1.7 Self pressurized hydrostatic mechanical seal A hydrostatic mechanical seal that uses the sealing medium itself as the pressurized fluid. 1.B Non-contacting mechanical seal (control film mechanical seal) General term for dynamic pressure mechanical seal and hydrostatic pressure mechanical seal. 1.9 Internally mounted mechanical seal Mechanical seal with the stop ring mounted on the inner side of the sealing end cover (or the part equivalent to the sealing end cover) (i.e. facing the main engine working chamber). 1.10 Externally mounted mechanical seal Mechanical seal with the stationary ring mounted on the outer side of the sealing end cover (or the part equivalent to the sealing end cover) (i.e. facing the side facing the main engine working chamber). National Bureau of Standards 1986-03-01 issued
1986-10-01 implementation
GB5894-86
Generally speaking, for this kind of seal, the wear of its end face can be directly monitored. 1.11 Mechanical seal with internal spring Mechanical seal with spring mounted inside the sealing fluid 1.12 Mechanical seal with external spring Mechanical seal with spring mounted outside the sealing fluid 1.13 Mechanical seal with high back pressure Mechanical seal with high back pressure The back of the compensating ring farthest from the sealing end face is on the high pressure side (see Figure 1, Figure 3). 1.1 Low back pressure Mechanical seal with internal spring Mechanical seal with back pressure The back of the compensating ring farthest from the sealing end face is on the low pressure side (see Figure 2, Figure 4). 1.15 Mechanical seal with inward leakage Mechanical seal with inward leakage The leakage direction of the sealing fluid between the sealing end faces is opposite to the centrifugal force direction. 1.16 Mechanical seal with outward leakage Mechanical seal in which the leakage direction of the sealing fluid between the sealing end faces is the same as the direction of the centrifugal force. 1.17 Spring rotating mechanical seal Mechanical seal in which the elastic element rotates with the shaft. 1.18 Spring standing mechanical seal Mechanical seal in which the elastic element does not rotate with the shaft. 1.19 Single spring mechanical seal Compensation mechanism: Mechanical seal containing only one spring. 1.20 Multi-spring mechanical seal Compensation mechanism: Mechanical seal with multiple springs. 1.21 Unbalanced mechanical seal Mechanical seal with load factor K1.
1.22 Balanced mechanical seal
balanced mechanical seal
A mechanical seal with load factor A1.
1.23 Single mechanical seal
singlc mcchanical seal
A mechanical seal composed of a pair of sealing faces. 1.24 Double mechanical seal
double mechanical seal
A mechanical seal composed of two pairs of sealing faces. 1.25 Axial double mechanical seal
axial double mechanical sealGB 5B94—86
A double mechanical seal arranged opposite or opposite to each other along the axial direction. 1.26 Radial double mechanical seal
radial double mechanical sealA double mechanical seal arranged along the radial direction. 1.27Tandem mechanical seal
Landem mechanical seal
A mechanical seal composed of two or more sets of single-end mechanical seals arranged in the same direction. 1.28Rubber bellows mechanical seal
Ruhber-bellows mcchanical sealThe auxiliary seal of the compensation ring is a rubber bellows mechanical seal. 1.29PTFE bellows mechanical sealPTFE-bellows mechanical seal!The auxiliary seal of the compensation ring is a PTFE bellows mechanical seal. 1.30Metal bellows mechanical seal
Metal bellows mcchanical sealThe auxiliary seal of the compensation ring is a metal bellows mechanical seal. 1.31Welded metal bellows mechanical seal
Welded mctal-bellows mechanical sealA mechanical seal using a gold fan bellows formed by welding wave plates. 1.321: Formed metal bellows mechanical seal Formed metal bellows mechanical seal 1.33 Mechanical seal with floating intermediary ring A mechanical seal in which a sealing ring is held by a rotating ring and a stationary ring and wears against them and can float in the radial direction. 1.34 Magnetic mechanical seal A mechanical seal that uses magnetic force instead of elastic force to compensate. 2 Mechanical seal parts and corresponding terms 2.1 Seal ring
seal ring
In mechanical sealing, two annular parts whose end faces are perpendicular to the axis of rotation and slide relative to each other are called seal rings. 2.2 Close end face
seal face
The end face of a seal ring that fits with another seal ring during operation. This end face is usually a ground surface. 2.3 Seal interlace
The interface between a pair of sealing end faces that fit each other. 2.4 Rotating ring (dynamic ring)
rotating ring
A seal ring that rotates with the shaft.
2.5 Stationary ring (static ring)
stationary ring
A seal ring that does not rotate with the shaft
compensated ring
A seal ring with axial compensation capability.
2.7 Uncompensated ring
uncompensated ring
A sealing ring without axial compensation capability. Compensating ring assembly
Compensating ring assembly
Seal head
GB 5894-86
A part used to connect the shaft and position the bellows. 2.20 Retaining seat
GB 5894-
A part used to fix with the shaft or sleeve and directly drive the rotating ring to rotate. 2.21 Driving screw
driving screw
A screw that transmits torque.
2.22 Set screw
Set screw
A screw used to fix the spring seat, driving seat or other parts on the shaft or sleeve. 2.23 snap ring A part that acts as an axial limit for compensating rings. 2.24 clamp ring A part that clamps a rubber or polytetrafluoroethylene bellows to the shaft. 2.25 anti-rutating pin A pin used to prevent two adjacent parts from rotating relative to each other. 2.26 annular sral space Generally refers to the annular space between the rotating shaft and the stationary housing where the seal is to be installed. 2.27 seal rhamher A stationary housing that occupies the seal cavity. 2.28 end cover A part that is connected to the seal cavity to support the stationary ring assembly. 2.29 Elastic component
Elastic component such as spring or bellows. 2.30 Friction pair
a pair of friction cormponscntsA pair of components used in pairs.
3 Fluid and circuit terminology
3.1 Inner circulation
inner circulation
A method of using the pressure difference of the main engine or the card difference of the pump effect device in the sealing chamber to form a closed circuit through the sealing chamber to improve the sealing conditions. Separators, filters and coolers can be set in the pipeline. 3.2 Outer circulation
outer circulalion
A method of circulating the isolated fluid by using an external pump, a pump effect device in the sealing chamber or the thermal siphon effect. Self-circulation
sclf circulation
GB 5894-86
A method of using a pumping device in the sealing cavity to form a closed loop of the sealing fluid to improve the working conditions of the seal. 3.4 Flushing
For an internal single-end mechanical seal, when the sealed medium is not suitable as the sealing fluid, a fluid compatible with the sealed medium is called into the sealing cavity from the outside to improve the working conditions of the seal. 3.5 Flushing fluid
flush fluid
An external fluid that plays a flushing role.
3.6 Quench
When a single-end mechanical seal is used to seal a medium that is easy to crystallize or dangerous, a simple seal (such as a bushing seal, a packing seal, a hip seal, etc.) is set on the outside (atmospheric side) of the mechanical seal. A method of introducing a clear neutral fluid with a slightly higher pressure than the atmospheric positive pressure between two seals to cool or heat the seal and take away the leaked sealed medium in time to improve the working conditions of the seal. s. Quench fluid
Quench fluid
External fluid that acts as a quench.
a, Isolation fluid
Buffer fluid
In double-end mechanical seals, tandem mechanical seals, vertical single-end mechanical seals with oil cups or external fluid static [long mechanical seals, it is a sealing fluid that is introduced from the outside and is compatible with the sealed medium. 3.9 Temperature-adjustable fluid
Temperatureadjustablefluid
External circulating fluid that does not contact the seal end face and can cool or heat the seal. 3.10 Coolant
Temperature-adjustable fluid that acts as a cooling fluid.
3.11 Heating fluid
heating fluid
Thermostatic fluid for heating.
3.12 Sealed medium
Sealed mediuin
The working medium in the main engine that needs to be sealed. 3.13 Sealing fluid
scalant
The high-pressure side fluid that the sealing end directly contacts. It can be the sealed medium itself, the sealed fluid that has been separated or filtered, the flushing fluid or the isolation fluid.
4 Commonly used design tests and performance terms
4,1 Sealing band
seal band
The annular area between the narrower outer diameter d and the inner diameter d of the sealing end face. 4.2 Sealing band area A
seal band arca
The area of ​​sealing band A=-
4.3 Spring specific pressure Ps
spring pressure
GH 589486
The force applied by the elastic element to the unit area of ​​the sealing band. 4.4 Closing force F.
closing force
The force caused by the sealing fluid pressure and the elastic force of the elastic element (or the magnetic force of the magnetic element) acting on the compensation ring to make it close to the non-compensation ring.
4.5 Opening force F.
opening force
The force acting on the compensation ring to make it open to the non-compensation ring. This force is generally caused by the pressure of the fluid film between the sealing end faces.
4.6 Back pressure factor
The ratio of the average pressure of the fluid film between the sealing end faces to the sealing fluid pressure. 4.7 Balance diameter (hydraulic diameter) d
balance diameter (hydraulic diameter) The effective acting diameter of the positive force of the sealing fluid at the auxiliary seal (i.e., secondary seal). Depending on the specific structure, it is either the diameter of the inner surface in contact with the auxiliary seal ring or the diameter of the outer surface in contact with the auxiliary seal ring. As shown in Figures 1 to 4. Figure 1 Back side high pressure static type (I)
Figure 3 Back side decompression static type (1)
Figure 2 Back side low pressure rotary type (1)
Figure 4 Back side low pressure rotary type (II)
4.8 Load factor (balance factor) K
load factor (balance factor)
GB 5894-86
The sealing fluid force acts on the compensation ring, so that the ratio of the effective action area A for the non-compensation ring to the sealing ring area A is: K =
For back side high pressure seal: A. -Ma
(-d) -
For back side low pressure seal: A. =
4.9 Effective true diameter d of the bellows.
(dé-dg)
effective diameter of bellowsK
Effective diameter when subjected to internal pressure: When the inner side of the bellows is subjected to a certain amount of fluid pressure and the length is 1.When the bellows is subjected to a certain fluid pressure and its length L remains unchanged, the force F generated in the axial direction is equivalent to the force generated when the annular piston end face between the bellows outer diameter d and the effective diameter d is subjected to pressure p, that is, F
(dd)p (see Figure 6). When the bellows is subjected to a certain fluid pressure and its length L remains unchanged, the force F generated in the axial direction is equivalent to the force generated when the annular piston end face between the bellows outer diameter d and the effective diameter d is subjected to pressure p, that is, F
(dd)p (see Figure 6). When calculating the end face specific pressure of metal or polytetrafluoroethylene bellows mechanical seals, the effective diameter d of the bellows is equivalent to the balance diameter db in the mechanical seal with auxiliary sealing ring. 4. 10 Fluid film
fluid film
fluid film between the end faces of mechanical seals.
4.11 Friction force of secondary seal Fl
Friction force of secondary seal when compensating ring moves axially at secondary seal. ±.12 Face pressure e
face pressure.
GB5894—86
The net remaining closing force acting on the unit area of ​​sealing ring L. When the friction of secondary seal is ignored, it is equal to the difference between closing force and opening force divided by the area of ​​sealing ring. P. 4.13 pv value
pyyalue
The product of sealing fluid pressure p and average sliding velocity v of sealing end face. 4.14 Limiting pu value
limiting py value
The value when the seal reaches failure. It indicates the water content of the braid seal. 4.15 Working pu value
working py value
Limiting pu value divided by safety factor.
p,yvalue
The product of the positive ratio P, of the end face and the average sliding velocity of the sealing end face. 4.17. Limiting value
limiting pe v valve
The value at which the seal reaches failure. It indicates the working capacity of the sealing material. 4.18 Allowable P,V value
working P, y valve
The limiting peU value divided by the safety factor.
4.19 Dry friction
dry running
The friction state in which there is no fluid lubricating film between the sealing end faces (except for adsorbed gas or vapor). 4.20 Boundary friction (boundary lubrication)
Boundary friction (boundary lubrication)fF
The friction state in which there is a thin and discontinuous fluid film between the sealing end faces that is only one layer thick. In this friction state, solid contact occurs locally, and the viscosity of the lubricating film has little effect on the friction properties, and the pressure of the fluid film cannot be measured. 4.21 Fluid friction (fluid film lubrication)
full film friction (full film lubrication) The friction state in which the sealing end faces are completely separated by the fluid film. 4.22 Mixed friction (mixed film lubrication)
mixed film frietion (mixed film lubricatior) The friction state in which fluid friction and boundary friction exist simultaneously between the sealing end faces. 4.23 Cavitation
cavitation
A phenomenon in which dust vapor (gas) bubbles are locally generated between the sealing end faces. It usually occurs in the area where the pressure decreases rapidly. 4.24 Flashing
A phenomenon in which the liquid film suddenly vaporizes rapidly between the sealing interfaces. This phenomenon usually occurs when the friction heat is too large or the pressure of the liquid is lower than its saturated steam due to excessive pressure drop. 4.25 Friction coefficient!
friction factor
The ratio of the friction force of the sealing end face to the net closing force. 4.26Frictional torque Mr
Frictian torque
GB5894—86
The torque caused by the friction of the end face during the normal operation of the mechanical seal. 4.27Stirring torque M
Stirring torque
The torque caused by the stirring effect of the rotating component on the fluid during the normal operation of the mechanical seal. 4.28Starting torque Mh
Break out torque
The maximum torque required by the mechanical seal at the start. 4.29Power consumption N
power consumption
The total power consumption caused by various factors such as end face friction and stirring effect of the rotating component during the operation of the mechanical seal. 4. 30Leakage amount
leakage rale
The total amount of fluid leaked through the main seal and auxiliary seal per unit time. 4.31 Runout
run out
refers to the dynamic radial runout caused by the non-concentricity of the rotating ring to the rotating axis or the dynamic end face runout caused by the non-perpendicularity of the end face of the non-compensating ring to the rotating axis.
4.32 Tracking
Iracing abilily
When the mechanical seal has runout, servo and shaft vibration, the performance of the compensating ring to keep close to the non-compensating ring. If this performance is poor, the sealing end face will separate and cause large leakage. 4.33 Wear rate
wear rate
-The amount of wear on a sealing end face per unit time. 4.34 Run-in
run-in
The process in which the friction coefficient, wear rate and leakage rate of the sealing end face gradually tend to a stable value at the beginning of the seal. 4.35 Run-in period
run-in period
The time required for the running-in process.
4.38 Operating life
operating life
The cumulative operating time of a mechanical seal from the beginning of operation to failure, under the premise of reasonable selection and correct installation and use. 4.37 Statistical life
statistical life
The operating life of a batch of mechanical seals when the failure rate reaches a certain percentage. 4. 38 Operating period
operating period
The period from the beginning of use to the failure of a mechanical seal. 4.39 Early failure
abortive failure
GB 5894-86
refers to the failure situation in which the working life of the mechanical seal is far beyond the statistical life due to reasons such as improper selection or installation and use. H
4.0 Type test
modeling testi
It is a test conducted during the research and trial production of new machine core seal products to verify whether they have the specified performance. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Mechanical Seals Factory!yvalue
The product of the positive ratio of the end face P, and the average sliding velocity of the sealing end face. 4.17. Limiting value
limiting pe v valve
The value at which the seal reaches failure. It indicates the working capacity of the sealing material. 4.18 Allowable P,V value
working P, y valve
Limiting peU value divided by the safety factor.
4.19 Dry friction
dry running
The friction state in which there is no fluid lubricating film between the sealing end faces (except for adsorbed gas or vapor). 4.20 Boundary friction (boundary lubrication)
Boundary friction (boundary lubrication)fFwww.bzxz.net
The friction state in which there is a layer of fluid film that is only one layer thick and discontinuous between the sealing end faces. In this friction state, solid contact occurs locally, the viscosity of the lubricating film has little effect on the friction properties, and the pressure of the fluid film cannot be measured basically. 4.21 Full film friction (full film lubrication) Friction state in which the seal faces are completely separated by a fluid film. 4.22 Mixed friction (mixed film lubrication) Friction state in which both fluid friction and boundary friction exist between the seal faces. 4.23 Cavitation A phenomenon in which dust vapor (gas) bubbles are locally generated between the seal faces. It usually occurs in areas where the pressure decreases rapidly. 4.24 Flashing A phenomenon in which the liquid film suddenly and rapidly vaporizes between the seal interfaces. This phenomenon usually occurs when the friction heat is too large or the pressure of the liquid is lower than its saturated vapor due to excessive pressure drop. 4.25 Friction factor The ratio of the friction force on the seal face to the net closing force. 4.26 Frictional torsion Mr
Frictian torquc
GB5894—86
The torque caused by the friction of the end face during the normal operation of the mechanical seal. 4.27 Stirring torque M
Stirring torque
The torque caused by the stirring effect of the rotating component on the fluid during the normal operation of the mechanical seal. 4.28 Breakout torque Mh
Breakout torque
The maximum torque required by the mechanical seal at the start. 4.29 Power consumption N
power consumption
The total power consumption caused by various factors such as end face friction and stirring effect of the rotating component during the operation of the mechanical seal. 4. 30 Leakage
Leakage rale
The total amount of fluid leaked through the main seal and auxiliary seal per unit time. 4.31 Runout
run out
refers to the dynamic radial runout caused by the non-concentricity of the rotating ring to the rotating axis or the dynamic end face runout caused by the non-perpendicularity of the end face of the non-compensating ring to the rotating axis.
4.32 Tracking
Iracing abilily
When the mechanical seal has runout, servo and shaft vibration, the performance of the compensating ring to keep close to the non-compensating ring. If this performance is poor, the sealing end face will separate and cause large leakage. 4.33 Wear rate
wear rate
-The amount of wear on a sealing end face per unit time. 4.34 Run-in
run-in
The process in which the friction coefficient, wear rate and leakage rate of the sealing end face gradually tend to a stable value at the beginning of the seal. 4.35 Run-in period
run-in period
The time required for the running-in process.
4.38 Operating life
operating life
The cumulative operating time of a mechanical seal from the beginning of operation to failure, under the premise of reasonable selection and correct installation and use. 4.37 Statistical life
statistical life
The operating life of a batch of mechanical seals when the failure rate reaches a certain percentage. 4. 38 Operating period
operating period
The period from the beginning of use to the failure of a mechanical seal. 4.39 Early failure
abortive failure
GB 5894-86
refers to the failure situation in which the working life of the mechanical seal is far beyond the statistical life due to reasons such as improper selection or installation and use. H
4.0 Type test
modeling testi
It is a test conducted during the research and trial production of new machine core seal products to verify whether they have the specified performance. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Mechanical Seals Factory!yvalue
The product of the positive ratio of the end face P, and the average sliding velocity of the sealing end face. 4.17. Limiting value
limiting pe v valve
The value at which the seal reaches failure. It indicates the working capacity of the sealing material. 4.18 Allowable P,V value
working P, y valve
Limiting peU value divided by the safety factor.
4.19 Dry friction
dry running
The friction state in which there is no fluid lubricating film between the sealing end faces (except for adsorbed gas or vapor). 4.20 Boundary friction (boundary lubrication)
Boundary friction (boundary lubrication)fF
The friction state in which there is a layer of fluid film that is only one layer thick and discontinuous between the sealing end faces. In this friction state, solid contact occurs locally, the viscosity of the lubricating film has little effect on the friction properties, and the pressure of the fluid film cannot be measured basically. 4.21 Full film friction (full film lubrication) Friction state in which the seal faces are completely separated by a fluid film. 4.22 Mixed friction (mixed film lubrication) Friction state in which both fluid friction and boundary friction exist between the seal faces. 4.23 Cavitation A phenomenon in which dust vapor (gas) bubbles are locally generated between the seal faces. It usually occurs in areas where the pressure decreases rapidly. 4.24 Flashing A phenomenon in which the liquid film suddenly and rapidly vaporizes between the seal interfaces. This phenomenon usually occurs when the friction heat is too large or the pressure of the liquid is lower than its saturated vapor due to excessive pressure drop. 4.25 Friction factor The ratio of the friction force on the seal face to the net closing force. 4.26 Frictional torsion Mr
Frictian torquc
GB5894—86
The torque caused by the friction of the end face during the normal operation of the mechanical seal. 4.27 Stirring torque M
Stirring torque
The torque caused by the stirring effect of the rotating component on the fluid during the normal operation of the mechanical seal. 4.28 Breakout torque Mh
Breakout torque
The maximum torque required by the mechanical seal at the start. 4.29 Power consumption N
power consumption
The total power consumption caused by various factors such as end face friction and stirring effect of the rotating component during the operation of the mechanical seal. 4. 30 Leakage
Leakage rale
The total amount of fluid leaked through the main seal and auxiliary seal per unit time. 4.31 Runout
run out
refers to the dynamic radial runout caused by the non-concentricity of the rotating ring to the rotating axis or the dynamic end face runout caused by the non-perpendicularity of the end face of the non-compensating ring to the rotating axis.
4.32 Tracking
Iracing abilily
When the mechanical seal has runout, servo and shaft vibration, the performance of the compensating ring to keep close to the non-compensating ring. If this performance is poor, the sealing end face will separate and cause large leakage. 4.33 Wear rate
wear rate
-The amount of wear on a sealing end face per unit time. 4.34 Run-in
run-in
The process in which the friction coefficient, wear rate and leakage rate of the sealing end face gradually tend to a stable value at the beginning of the seal. 4.35 Run-in period
run-in period
The time required for the running-in process.
4.38 Operating life
operating life
The cumulative operating time of a mechanical seal from the beginning of operation to failure, under the premise of reasonable selection and correct installation and use. 4.37 Statistical life
statistical life
The operating life of a batch of mechanical seals when the failure rate reaches a certain percentage. 4. 38 Operating period
operating period
The period from the beginning of use to the failure of a mechanical seal. 4.39 Early failure
abortive failure
GB 5894-86
refers to the failure situation in which the working life of the mechanical seal is far beyond the statistical life due to reasons such as improper selection or installation and use. H
4.0 Type test
modeling testi
It is a test conducted during the research and trial production of new machine core seal products to verify whether they have the specified performance. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Mechanical Seals Factory!32 Tracking performance
Iracing abilily
When the mechanical seal has jumping, servo movement and the shaft is in sync, the performance of the compensation ring to keep close to the non-compensation ring. If this performance is poor, the sealing end face will separate and cause large leakage. 4.33 Wear rate
wear rate
-The amount of wear on a sealing end face per unit time. 4.34 Running-in
run-inperind
The process in which the friction coefficient, wear rate and leakage rate of the sealing end face gradually tend to a stable value at the beginning of the seal. 4.35 Running-in period
run-inperind
The time required for the running-in process.
4.38 Operating life
operating life
The cumulative operating time of the mechanical seal from the beginning of operation to failure under the premise of reasonable selection and correct installation and use. 4.37 Statistical life The operating life of a batch of mechanical seals when the failure rate reaches a certain percentage. 4. 38 Operating period The period from the beginning of use to the failure of a mechanical seal. 4.39 Abortive failure GB 5894-86 Refers to the failure of a mechanical seal whose operating life is far beyond the statistical life due to improper selection or installation and use. 4.0 Type test The test conducted for the research and trial production of new mechanical seal products to verify whether they have the specified performance is not self-tested. This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and was under the jurisdiction of the General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Mechanical Seals Factory!32 Tracking performance
Iracing abilily
When the mechanical seal has jumping, servo movement and the shaft is in sync, the performance of the compensation ring to keep close to the non-compensation ring. If this performance is poor, the sealing end face will separate and cause large leakage. 4.33 Wear rate
wear rate
-The amount of wear on a sealing end face per unit time. 4.34 Running-in
run-inperind
The process in which the friction coefficient, wear rate and leakage rate of the sealing end face gradually tend to a stable value at the beginning of the seal. 4.35 Running-in period
run-inperind
The time required for the running-in process.
4.38 Operating life
operating life
The cumulative operating time of the mechanical seal from the beginning of operation to failure under the premise of reasonable selection and correct installation and use. 4.37 Statistical life The operating life of a batch of mechanical seals when the failure rate reaches a certain percentage. 4. 38 Operating period The period from the beginning of use to the failure of a mechanical seal. 4.39 Abortive failure GB 5894-86 Refers to the failure of a mechanical seal whose operating life is far beyond the statistical life due to improper selection or installation and use. 4.0 Type test The test conducted for the research and trial production of new mechanical seal products to verify whether they have the specified performance is not self-tested. This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and was under the jurisdiction of the General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by Tianjin Mechanical Seals Factory!
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