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- needle valve seat hermetic test device 针阀座气密度试验器
- needle valve seat 针状活门座
- Clean or replace the relief valve seat. 清洗或更换安全阀阀座。
- Forward needle valve positions for easy access. 针形阀位置提前,便于接近。
- Damage or fouled relief valve seat. 安全阀阀座损坏或受到污染。
- Damaged or fouled relief valve seat. 安全阀阀座受到损坏或污染。
- Attach vent (yellow) hose to TC#4 and vent needle valve. 连接排气（黄）软管到测试旋塞4号和排气针形阀上。
- Place the relief valve seat back into the chamber bore. 将安全阀阀座放回到镗孔内。
- Open TC#3, needle valve "B ", and vent needle valve. 开启测试旋塞3号，针形阀“B”，和排气针形阀。
- Slide the diaphragm assembly into the relief valve seat. 将隔膜总成滑进到安全阀阀座内。
- Open TC#2 and needle valve "A", close needle valve "A" and TC #4. 开启测试旋塞2号和针形阀“A”，关闭针形阀“A”和测试旋塞4号。
- Close needle valve "A" high side (red) and open test cock No. 2. 关闭针形阀“A”高端（红），并开启测试旋塞2号。
- Remove the pressed in relief valve seat and seat O-ring. 拆卸压进去的安全阀阀座和阀座O形环。
- All needle valves must be closed on test kit. 检测组件上的所有针形阀必须关闭。
- The maximum differential pressure across the valve seat. 通过阀门阀座的最大压差。
- Quick replaceable valve seat, convenient maintenance. 阀座可以快换，维修方便。
- Stellite takes a high polish and is used in steel valve seat rings. 钨铬钴合金具有很高的抛光度，用作钢阀门的阀座环。
- Open vent needle valve and bleed air from hose. Then close vent valve. 开启排气针形阀，并从软管排放空气。然后关闭排气阀。
- Open vent needle valve fully until dripping from vent connection stops. 完全开启排气针形阀直到从排气连接处的滴漏停止为止。
- Open test cock No. 2 and needle valve "A" high side (red) on test kit. 开启测试旋塞2号和检测组件上的针形阀“A”高端（红）。
