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 valve axis 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 center to end dimensions)
The distance between the plane perpendicular to the axis at one terminal of the valve body passage and the axis of the other terminal of the valve body.
4. Structural form (type of construction)
The main characteristics of various valves in terms of structure and geometry.
5. Through way type
The inlet and outlet axes are coincident or 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-globe type, y-type, diaphragm type)
The passage is in a straight line, and the position of the valve stem forms an acute angle with the axis of the passage of the valve body.
8. Three way type
Body form with three passage directions.
9. T-pattern three way
The passage of the plug (or sphere) is a three-way type of "T".
10. L-pattern three way
The passage of the plug (or sphere) is in the form of a three-way "L".
11. Balance type
A structural form that uses medium pressure to balance its axial force on the valve stem.
12. Lever type
The structural form of the lever driving the opening and closing parts is adopted.
13. Normally open type (normally open type)
When there is no external force, the opening and closing parts are automatically in the open position.
14. Normally closed (normally closed type)
When there is no external force, the opening and closing parts are automatically in the closed position.
15. Insulation type (steam jacket type)
Various valves with steam heating jacket construction.
16. Bellows seal type
Various valves with bellows construction.
17. Full-bore valve (full-opening valve)
Valves with the same inner diameter of the flow path in all parts of the valve as the nominal pipe inner diameter.
18. Reduced-opening valve
A valve in which the diameter of the flow channel hole in the valve is reduced.
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. Two-way valve (bi-directional valve)
Valve designed to seal in both media flow directions.
22. Two-seat two-way valve
(twin-seat, both seats bi-directional, valve)
The valve has two sealing seats, and each valve seat can seal the valve in both medium flow directions.
23. Double-seat valve with one-way seat and one-way seat
(twin-seat, one seat un-directional and one seat bi-directional, valve)
For the valve with two sealing pairs, in the closed position, the two sealing pairs can maintain the sealing state at the same time, and 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)
When the valve is fully open, it is a sealing structure that prevents the medium from leaking from the stuffing box.
25. Pressure seal
The pressure of the working medium makes the joint between the valve body and the valve cover realize the automatic sealing structure.
26. Dimension of valve stem head
The structural dimensions of the joints between the valve stem and the handwheel, handle or other operating mechanical assemblies.
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 opening and closing parts and the valve stem assembly connection.
29. Connection form (type of connection)
Various methods (such as flange connection, thread connection, welding connection, etc.)