闸阀阀座气密性
GATE VALVE SEAT TIGHTNESS
- 焊进钨铬钴合金6表面阀座和13 CR，316不锈钢，Monel柔性楔板，或钨铬钴合金6硬面。
Welded-in Stellite 6 faced seats and a flexible
wedge in 13 CR, SS 316, Monel or hardfaced with Stellite 6.
- 阀座面研磨抛光到2 RMS。
Seating faces ground and lapped to 2 RMS.
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工厂可接受的闸阀阀座泄漏标准
Factory Acceptance Standard for Gate Valve Seat
Leakage |
通径
英寸
Size
in |
Velan标准
( VEL-NDT-571)
Velan Standard
(VEL-NDT-571) |
阀座泄漏率(1) (API 598-October 1996)
Seat Leakage Rate(1) (API 598-October
1996) |
低压测试
Low Pressure Test |
高压测试
High Pressure Test |
| 2 |
0 |
0 |
0 |
| 21/2-6 |
0 |
24 |
12 |
| 8-12 |
0 |
40 |
20 |
| 14+ |
28 |
56 |
28 |
(1) 泄漏率是指低压测试时每分钟气泡数和高压测试时每分钟滴漏数。
(1) Leakage rates are in bubbles per minute
for low pressure test and drops per minute for high pressure test |
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