Rising Stem Type Gate Valve

Non-rising Stem Gate Valve

Wedge Gate Valve -> Non-rising Stem Gate Valve
Non-rising stem gate valve is used where vertical space is limited or underground. The stem is threaded into the gate. As the handwheel on the stem is rotated, the gate travels up or down the stem on the threads while the stem remains vertically stationary. This type of valve has a pointer indicator threaded onto the upper end of the stem to indicate the position of the gate.

Features of Non-rising Stem Gate Valves:
Non-rising stem and inside stem screwl
Flexible wedge, fully guided
Metal seat and resilient seat available
Renewable seat ring and stem backseat
Manual operation standard, gear operator and actuation available
Flange end: Raised face or ring type joint

Applicable standards of Non-rising Stem Gate Valves:
A) Design & Manufacture: API 600, API 6D, BS 1414
B) Face to Face: API 6D, ASME B16.10, EN 558, DIN 3202, BS 2080
C) Connection End: ASME B16.5, EN 1092, JIS B2220
D) Test: API 600, API 6D, EN 12266

Sizes: 2" - 36" or DN 50 - DN 900
Pressure Rating: Class 150 - Class 900 or PN 16 - PN 150
Valve Materials: WCB, LCB, WC6, WC9, CF8, CF8M, Cast iron, etc.
Operated by: Handwheel, Gear, Pneumatic, Hydraulic and Electric actuator

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Potential faults	Faults reason	method of troubleshooting
Seal leakage	Seal ring impurities	Clean seal ring
	Damage of the sealing	Replace seal ring
upper seal leakage	Upper seal packing loose	Screw down packing or cover bolt
	Upper filling degradation	Oiling or replace the filling
Flange surface	The bolt haven't be tighten equally	Tighten the bolt with equally force
	Flange seal invalidation	Replace flange gasket
switch jam	Driving device to dry	add lubricants to the driving device
switch malfunction	Driving device damage	Replace driving device or repair by professional people