Typical Pressure Seal Bonnet Gate Valves

Cast Steel Bolted Bonnet Gate Valves This illustration represents a typical Kinka pressure seal bonnet gate valves. There will be some minor modifications in each class, type and size.
1. Body with seal-welded seat rings which are hard faced with stellite.
2. Bonnet with stellited integral backseat.
3. Yoke is mounted directly on the body. In Type B design, sizes 4" and smaller have an integral yoke and gasket retainer which is screwed into the body to hold the gasket.
4. Disc is flexible wedge type, and seat surface are hard faced with stellite.
5. Stem
6. Gasket Retainer is either a segmented ring (Type A) or one-piece threaded ring (Type B).
7. Gasket
8. Bonnet Bolts (Type A)
Bonnet Nut (Type B)
9. Gland is two-piece, ball type which exerts uniform pressure on the packing without binding the stem in the event that nuts are unevenly tightened.
10. Gland Packing
11. Anti-Friction Bearings are used on most valves.
12. Handwheel or Bevel-Gear Type Valve Operator (not illustrated here)