Non-Rising stem flexible seat gate valve

Non-Rising stem flexible seat gate valve

A gate valve is a linear motion valve used to start or stop fluid flow; however, it does not regulate or throttle flow. The name gate is derived from the appearance of the disk in the flow stream. The figures on the right show the general appearance and cross-sections of typical gate valves.

The disk of a gate valve is completely removed from the flow stream when the valve is fully open. This characteristic offers virtually no resistance to flow when the valve is open. Hence, there is little pressure drop across an open gate valve. When the valve is fully closed, a disk-to-seal ring contact surface exists for 360°, and good sealing is provided. With the proper mating of a disk to the seal ring, very little or no leakage occurs across the disk when the gate valve is closed.

A gate valve can be used for a wide variety of fluids and provides a tight seal when closed. The major disadvantages to the use of a gate valve are: 1) It is not suitable for throttling applications. 2) It is prone to vibration in the partially open state. 3) It is more subject to seat and disk wear than a globe valve. Repairs, such as lapping and grinding, are generally more difficult to accomplish.

Non-Rising stem flexible seat gate valve can be described as follows: 1)design& manufacture : API 600, API 6D, BS 1414, ASME B16.34 ; 2)face to face: API 6D, ASME B16.10, DIN 3202, BS2080 ; 3)connection end: ASME B16.5, ASME B16.25 ; 4)test: ISO5208, API 600, BS 6755 ; 5)sizes: 1/2" - 36" or DN12 - DN900 ; 6)pressure rating: class150 - class1500 or PN16 - PN250 ; 7)material: WCB, LCB, WC6, WC9, C12, C5, CF8, CF3, CF3M, CF8M, etc. ; 8)operated by: handwheel, gear, pneumatic, hydraulic and electric actuator.