【 Informations de vulgarisation scientifique 】 -100 Terminologie des vannes à voir absolument
La quantité maximale de condensat pouvant être évacuée d'une vanne de vidange à une différence de pression et une température données.
Valve Definition Terminology
1. Valve
The overall mechanical product with a movable mechanism used to control the flow of media in pipelines.
2. Gate valve, slide valve
A valve whose opening and closing components (gate) are driven by the valve stem and move up and down along the valve seat (sealing surface).
3. Globe valve, stop valve
The open and close type (valve disc) is a valve that is driven by the valve stem and moves up and down along the axis of the valve seat (sealing surface).
4. Throttle valve
A valve that adjusts flow and pressure by changing the cross-sectional area of the passage through a valve disc.
5. Ball valve
An open and closed (spherical) valve that rotates around a curve perpendicular to the path.
6. Butterfly valve
Open close (butterfly plate) valve that rotates around a fixed axis.
7. Diaphragm valve
The open and close type (diaphragm) is a valve driven by the valve stem, which moves up and down along the axis of the valve stem, and separates the actuating mechanism from the medium.
8. Cock valve
Open close (plug) valve that rotates around its axis.
9. Check valve, non return valve
Open and close (valve disc) is a valve that uses the force of the medium to automatically prevent the reverse flow of the medium.
10. Safety valve, relief valve
Open and close type (valve disc) automatically opens and discharges when the pressure of the medium in the pipeline or machine equipment exceeds the specified value; A valve that automatically closes when it falls below the specified value, providing protection for pipelines or machines.
11. Pressure reducing valve
A valve that reduces the pressure of the medium through the throttling of the opening and closing parts (valve disc), and automatically maintains the pressure behind the valve within a certain range through the direct effect of the pressure behind the valve.
12. Steam trap
A valve that automatically discharges condensate and prevents steam leakage.
13. Drainage Valves
Valves used for discharging pollutants from equipment such as boilers and pressure vessels.
14. Low pressure valve
Various valves with nominal pressure PN ≤ 1.6MPa.
15. Middle pressure valve
Various valves with nominal pressures ranging from PN ≥ 2.0 to PN < 10.0MPa.
16. High pressure valve
Various valves with nominal pressure PN ≥ 10.0MPa.
17. Ultra high pressure valve
Various valves with nominal pressure PN ≥ 100.0MPa.
18. High temperature valve
Used for various valves with medium temperatures above 450 ℃.
19. Low temperature valve (sub zero valve)
Used for various valves with medium temperatures ranging from -40 ℃ to -100 ℃.
20. Cryogenic valve
Used for various valves with medium temperature<-100 ℃.
Terminology for valve structure
1. Face to face dimension, face-to-centre dimension)
The distance between the inlet and outlet end faces of the valve; Or the distance from the inlet end face to the outlet axis.
2. Length of straight through valve structure
(through way type of valves Face to face dimensions)
The distance between two planes perpendicular to the valve axis at the end of the valve body channel.
3. Length of angle valve structure
(angle type of valves Face to face, end to end, center to face and centerto end dimensions)
The distance between a plane perpendicular to the axis at one end of the valve body channel and the axis of the other end of the valve body.
4. Type of construction
The main characteristics of various types of valves in terms of structure and geometric shape.
5. Through type
The valve body form where the inlet and outlet axes coincide or are parallel to each other.
6. Angle type
The valve body form with the inlet and outlet axes perpendicular to each other.
7. DC type (y-global type, y-type,diaphragm type)
A valve body with a straight path and a sharp angle between the valve stem position and the valve body path axis.
8. Three way type
A valve body form with three path directions.
9. T-pattern three way
The passage of the plug (or sphere) follows a T-shaped three-way pattern.
10. L-pattern three way
The passage of the plug (or sphere) follows an L-shaped three-way pattern.
11. Balance type
The structural form of using medium pressure to balance its axial force on the valve stem.
12. lever type
The structural form of using a lever to drive the opening and closing components.
13. Normally open type
The structural form in which the opening and closing parts are automatically in the open position when there is no external force.
14. Normally closed type
The structural form in which the opening and closing parts are automatically in the closed position when there is no external force.
15. Steam jacket type
Various valves with steam heating jacket structures.
16. Bellows seal type
Various valves with corrugated pipe structures.
17. Full opening valve
A valve in which the inner diameter of all flow channels inside the valve is the same as the nominal inner diameter of the pipeline.
18. Reduced opening valve
A valve with a reduced diameter of the flow passage hole inside the valve.
19. Reduced core valve
The diameter of the flow passage hole inside the valve is reduced, and the flow passage opening of the valve closure part is a non circular valve.
20. Unidirectional valve
A valve designed to seal in only one direction of medium flow.
21. Bi directional valve
A valve designed to seal in both directions of medium flow.
22. Double seat bidirectional valve
(twin-seat, both seats bi-directional, valve)
The valve has two sealing seats, and both directions of medium flow on each seat can be sealed.
23. Double seat valves with one one-way seat and one two-way seat
(twin-seat, one seat un-directional and one seatsbi-directional, valve)
A valve with two sealing pairs can maintain a sealed state simultaneously when in the closed position. The valve body in the middle chamber (between the two sealing pairs) has an interface for releasing medium pressure. Represent the symbol DBB.
24. Back seat, back face
A sealing structure that prevents leakage of medium from the packing box when the valve is fully open.
25. Pressure seal
The structure utilizes medium pressure to achieve automatic sealing at the connection between the valve body and valve cover.
26. Dimension of valve stem head
The structural dimensions of the connecting parts between the valve stem and the handwheel, handle, or other operating machinery assembly.
27. Dimension of valve stem end
The structural dimensions of the connection between the valve stem and the opening and closing parts.
28. Dimension of connecting channel
The structural dimensions of the connection between the opening and closing components and the valve stem assembly.
29. Type of connection
The various methods used for connecting valves to pipelines or machinery equipment, such as flange connection, threaded connection, welding connection, etc.
Terminology for valve components
1. Valve body
A component that is directly connected to a pipeline (or machine equipment) and forms a medium flow channel.
2. Bonnet, cover, cap, lid
The main component that connects to the valve body and forms a pressure chamber with the valve body (or through other parts such as diaphragms).
3. Opening and closing components (disc)
A general term for a component used to cut off or regulate the flow of media, such as a gate in a gate valve, a valve disc in a throttle valve, etc.
4. Disc
The opening and closing components in valves such as globe valves, throttle valves, and check valves.
5. Body seat ring, shoulder seated, bottom seat)
The component installed on the valve body and forming a sealing pair with the opening and closing parts.
6. Sealing face
The two contact surfaces between the opening and closing parts and the valve seat (valve body) are tightly attached, providing a sealing effect.
7. Stem, apidle
The main components that transmit the opening and closing force to the opening and closing components.
8. Valve stem nut (yoke bushing, yoke nut)
The part that forms a motion pair with the valve stem thread.
9. Packing box
A structure in which packing is filled on the valve cover (or valve body) to prevent medium leakage from the valve stem.
10. Stuffing box
Parts that are filled with fillers to prevent media leakage from the valve stem.
11. Packing gland (gland, gland flange, pne-piece glang)
The part used to compress the packing to achieve sealing.
12. Packing, packing rings
Insert the filling material into the packing box (or packing box) to prevent leakage at the double valve stem of the medium.
13. Packing seat, packing washer
A component that supports the packing and maintains the sealing of the packing.
14. Bracket (yoke)
Parts used to support the valve stem nut and transmission mechanism on the valve cover or valve body.
15. Impact handwheel
(impact handwheel, hammer blow handwheelimpact handwheel, hammer blow handwheel)
A handwheel structure that utilizes impact force to reduce valve operating force.
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