Gate Valve

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Gate Valve

Post  landoo on Fri May 10, 2013 1:19 am

Gate valve opening and closing the gate, the direction of movement of the ram and perpendicular to the direction of flow, the valve can only be fully open and fully closed, can not be adjusted and throttle. There are two gate sealing surface, the most common mode of gate valve sealing surface formed two wedge, wedge angle with the valve parameters, usually 50 medium temperature is not high, 2 ° 52 '. Wedge gate valve can be made of a whole, called the rigid gate; also be made to trace deformation gate, in order to improve its process, make up the sealing surface angle deviation in the process, this gate The board called the flexible gate.
Valve closed, the sealing surface can only rely on media pressure to seal, that is, only the medium pressure to the sealing surface of the ram pressure to the other side of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of the valve is sealed by force, that is, the valve is closed, you have to rely on external forces forcibly ram pressure to the valve seat to ensure the sealing surface of the seal.
Gate valve with the valve stem with a straight line, called the lift rod valve. Usually in the riser trapezoidal thread through the guide groove on the top of the valve nut and body, the rotary motion into linear motion, that is, the operating torque thrust into action.
Open the valve, the valve gate valve lift height is equal to 1:1 times the diameter of the fluid channel completely, but at run time, this location can not be monitored. Actual use, the apex of stem as a sign that the fixed position, as its fully open position. Temperature appears to consider locking phenomenon, usually open to the vertex position, and then rewind 1/2-1 circle, as a fully open valve position. Therefore, the valve fully open position, is determined by the location of the gate.
Some valve stem nut located at the gate, hand driven rotation of the stem turn, leaving the gate to upgrade, this valve is called the rotating rod valve or called dark rod valve. Turn the handwheel by hand wheel and stem forward, back, improve or decline valve plate connected with the stem, to the role of opening and closing.
Flat-bottomed gate base: traditional gate valve often pass after the washing tube due to foreign objects such as stones, pieces of wood, cement, iron, and other debris deposition in the the valve bottom groove, likely to cause can not be closed tightly and form a water leakage, resilient seated gate valve at the bottom of the same with the water pipe machine flat design, easy to cause deposition of debris, the fluid unobstructed. Body precision casting, precision geometry makes the body without any finishing to ensure the tightness of the valve. Gate within the overall high quality rubber, outsourcing, plastic, Europe's leading vulcanized rubber vulcanization technology makes the gate to ensure accurate geometry and rubber ductile gate and then solid, easy to fall off and elastic memory.

landoo

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