Gate Valve : Pressure Seal Bonnet Type
Pressure Seal Bonnet | Product Range | Special Specification

The upper portion of the Yoke Sleeve is hexagonally tapered to fix the handwheel. The standard material of the Yoke Sleeve is Nodular Ni-resist D2 with over a 1150¨¬C (2100¨¬F) dissolution point in accordance with API Std. Specifications.
The bonnet is of a steel forging identical to the body to insure high reliability. The bonnet has a perfect body-bonnet seal and both ease of dismantling and reassembly are ensured. The bodies and bonnets of the valve are machined by special purpose machines to achieve perfect coaxiality and eliminate any misalignment which may damage the stems. 
The machined forged stem comes with a T-shape head, connects the slot of the wedge. The contacting surface of the head is spherically shaped, so giving it greater strength & durability. It is heat treated to give it adequate mechanical preperties and surface hardness. Accurate machining and lapping insure minimized friction during opening and shutting.
All of our valves  are provided with positive backseat, and packing replacement can be done with the Valve fully open. The conical seat and the guide are integrally stellite faced.
The Stellite 6 surface of the seat ring is integrally applied to the body by means of welding in all valve sizes. Lapping applied to the seating surface ensures perfect mating surface ensures perfect mating with the wedge surfaces.
The flexible wedge designed to absorb thermally-induced body distortion, thereby making it ideal for high temperature stem or water supply piping. A stellite 6 layer is applied to the seating surface, and this deposit is subjected to a special heat treatment to secure required hardness and soundness. The lapped finish then insures perfect mating with the seats.
The valve body is cylindrically shaped to prevent distortion or undue stress during extreme working conditions. In addition, adequate padding helps to achieve a sound cast structure critical area. The wall thickness is greater than, or in accordance with API, ANSI and ASME requirements. The contact surfaces ensure that a minimum specific pressure is achieved. The area contacting the pressure seal gasket has a stainless steel 18/8 inlay to eliminate corrosion wire drawing and to insure easy dismantling at all times. The close tolerances of the inside diameter of this area are attained by accurate machining and honing finish.

Pressure Seal Bonnet   [top]
NO Description ASTM Spec.
15 Handle Nut Steel
16 Set Screw Steel
17 Sleeve Gland Steel
19 Hand Wheel A395
21 Packing Commercial
22 Gasket Commercial
23 Grease Nipple Steel
29 Bearing Commercial

BILL OF MATERIAL
NO NAME OF PART ASTM SPECIFICATION
STANDARD HIGH TEMPERATURE SERVICE LOW TEMPERATURE SERVICE
1 BODY A216-WCB A217-WC6 A217-WC9 A217-C5 A217-C12 A352-LCB
2 BONNET A216-WCB A217-WC6 A217-WC9 A217-C5 A217-C12 A352-LCB
3 DISC A217-CA15 A217-WC6 A217-WC9 A217-C5 A217-C12 A352-LCB
4 BODY SEAT RING A105+HARD FACE A105+HARD FACE A105+HARD FACE A105+HARD FACE A105+HARD FACE A182-F304
5 STEM A182 F6a A182 F6a A182 F6a A182 F6a A182 F6a A276-304
7 BONNET BUSH A276-410 A276-410 A276-410 A276-410 A276-410 A276-304
8 PACKING GLAND A276-410 A276-410 A276-410 A276-410 A276-410 A276-304
9 GLAND FLANGE A105 A105 A105 A105 A105 A105
10 YOKE SLEEVE A439-D2C A439-D2C A439-D2C A439-D2C A439-D2C A439-D2C
11 BONNET BOLT A193-B7 A193-B7 A193-B7 A193-B7 A193-B7 A320-L7
12 BONNET NUT A194-2H A194-2H A194-2H A194-2H A194-2H A194-4
13 GLAND BOLT A193-B7 A193-B7 A193-B7 A193-B7 A193-B7 A320-L7
14 GLAND NUT A194-2H A194-2H A194-2H A194-2H A194-2H A194-4
26 YOKE A216-WCB A216-WC6 A216-WC9 A216-C5 A216-C12 A352-LCB
27 YOKE BOLT A193-B7 A193-B7 A193-B7 A193-B7 A193-B7 A320-L7
28 YOKE NUT A194-2H A194-2H A194-2H A194-2H A194-2H A194-4
32

PACKING WASHER

 A276-410 A276-410 A276-410 A276-410 A276-410 A276-304
33

RETAINER

 A276-410 A276-410 A276-410 A276-410 A276-410 A276-304
34

HINGE CLAMP

 A216-WCB A217-WC1 A217-WC6 A217-WC9 A217-C5 A352-LC1/LC2/LC3
35

BONNET CLAMP

 A216-WCB A217-WC1 A217-WC6 A217-WC9 A217-C5 A352-LC1/LC2/LC3
37

GASKET SPACER

 A276-410 A276-410 A276-410 A276-410 A276-410 A276-304

Product Range   [top]
MATERIAL A216 WCB
A217 WC6, WC9, C5, C12
A352 LCB, LC1, LC2, LC3
A351 CF8, CF8M, CF3, CF3M
etc.
CLASS 600#, 900#, 1500#, 2500#
SIZE 2' ~ 26'

Optional Specification   [top]
Eletric Actuator Operated Chain Wheel Operated Gear Operated By-pass Valve Limit Switch
Drains
ETC.