29

2020

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04

Valve structural terms

Author:


The distance between the inlet and outlet end faces of the valve; or the distance from the inlet end face to the outlet axis. 阀门进、出口端面之间的距离;或进口端面至出口轴线的距离。

1. Structure length (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. Structural length of straight-through valve

(through way type of valves Face to face dimensions)

 

The distance between two planes perpendicular to the axis of the valve at the end of the valve body passage.

 

3. Structural length of angle valve

(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 passage and the axis at the other end of the valve body.

 

4. Type of construction

 

The main characteristics of various types of valves in terms of structure and geometry.

 

5.Through way type

 

The valve body form has the inlet and outlet axes coincident or parallel to each other.

 

6.angle type

 

The valve body form has the inlet and outlet axes perpendicular to each other.

 

7.DC type (y-globe type, y-type, diaphragm type)

 

The valve body form has the passage in a straight line and the position of the valve stem and the axis of the valve body passage forming an acute angle.

 

8. Three way type

 

Valve body form with three passage directions.

 

9.T-pattern three way

 

The passage of the plug (or ball) is in the form of a "T" three-way.

 

10.L-pattern three way

 

The passage of the plug (or sphere) is in the shape of an "L" tee.

 

11.balance type

 

A structural form that utilizes medium pressure to balance its axial force on the valve stem.

 

12. Lever type

 

The structural form of the lever is used to drive the opening and closing parts.

 

13. Normally open type

 

When there is no external force, the opening and closing parts are automatically in the open position.

 

14.normally closed type

 

A 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 structure.

 

16. Bellows seal type

 

Various valves with bellows construction.

 

17. Full-opening valve

 

A valve in which the inner diameter of the flow passage in all parts of the valve is the same as the nominal pipe inner diameter.

 

18.Reduced-opening valve

 

A valve with a reduced diameter of the flow passage hole in the valve.

 

19. Reduced-bore valve

 

The diameter of the flow channel hole in the valve is reduced, and the flow channel opening of the valve closing part is a non-circular valve.

 

20. One-way valve (un-directional valve)

 

Valves designed to seal in only one direction of media flow.

 

21. Bi-directional valve

 

The valve is designed to be sealed in both directions of media flow.

 

22.Double-seat two-way valve

(twin-seat, both seats bi-directional, valve)

 

The valve has two sealing seats, and each valve seat can be sealed in both media flow directions.

 

23. Double-seat valve with one-way seat and two-way seat

(twin-seat, one seat un-directional and one seatsbi-directional, valve)

 

For a valve with two sealing pairs, when in the closed position, the two sealing pairs can maintain the sealing state at the same time. The valve body in the middle cavity (between the two sealing pairs) has a port for releasing the medium pressure. Represents the symbol DBB.

 

24. Upper seal (back seat, back face)

 

A sealing structure that prevents medium from leaking from the stuffing box when the valve is fully open.

 

25. Pressure seal

 

A structure that uses medium pressure to realize automatic sealing at the connection between the valve body and the valve cover.

 

26. Dimension of valve stem head

 

Structural dimensions of the connection between the valve stem and the handwheel, handle or other mechanical control assembly.

 

27. Dimension of valve stem end

 

Structural dimensions of the connection between the valve stem and the opening and closing parts.

 

28. Dimension of connecting channel

 

Structural dimensions of the assembly connection between the opening and closing parts and the valve stem.

 

29. Type of connection

 

Various methods used to connect valves to pipelines or machinery and equipment (such as flange connections, threaded connections, welded connections, etc.).