Gate is one of the more commonly used block valves, is mainly used to connect or truncation pipeline medium, does not apply to adjust the medium flow. Gate valve for pressure, temperature and diameter range is very large, especially suitable for medium and large diameter pipeline. Gate valve is closed, sealing surface can only rely on medium pressure to seal, that only depend on the medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the seal face seal, this is the seal. Most is adopt compulsory seal gate valve, the valve is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface sealing. Exercise: gate valve gate, as a straight line with the stem, also called rising stem gate valves. Usually in lifting lever on the trapezoidal thread, through the valve at the top of the nut and guide groove on the valve body, the rotation movement into linear motion, which is the operating torque thrust into operation. Open valve, when the gate hoisting height is equal to Industrial Valves size 1:1 times, fluid channels open completely, but at runtime, the position cannot be monitored. Actual use, is the stem apex as a sign, that is fixed position, as its full open position. To consider locking phenomenon in a temperature change, usually in the open to the vertex positions, pour 1/2-1 ring back, as the full open position of the valve. The valve fully open position, therefore, according to the location of the damper ( > the trip. Some gate valve stem nut in ram, hand wheel rotate to drive the valve stem, and make the damper to ascend, the Industrial Valves is called rotating lever gate or non-rising stem gate valves. According to the structure of the valve gate valve can be divided into: ( 1) Parallel gate valve, sealing surface parallel to the vertical centerline, the two gate valve sealing surface parallel to each other. In parallel in the gate Industrial Valves, with thrust wedge structure is used for common, both have double thrust wedge between the two gate, the gate valve is suitable for the low pressure of medium and small diameter ( DN40 - 300毫米) Gate valves. A between the two gate there is spring, spring can be preloaded force, is advantageous to the disc sealing. ( 2) Wedge gate valve, sealing surface and vertical centerline into some sort of perspective, the two seal face into a wedge gate valves. Sealing surface Angle generally have 2 ° 52 ´, 30 ´ 3 °, 5 °, 8 °, 10 °, such as Angle mainly depends on the size of the medium temperature. Generally the higher the working temperature, from the point of view should be more big, to reduce the temperature changes when the possibility of wedge gate valve in the main five categories: sealing wedge rigid single ram: simple structure, small size, use more reliable. But bevel processing, with high accuracy, easy clamping and bruises occur, it is interesting, in the temperature of all kinds of medium and the pressure valve. Wedge elastic single ram: can be generated by ram trace of elastic deformation compensation function to achieve good sealing, temperature change is not easy to cause death of wedge, wedge Angle precision is low. But should prevent closure torque too big and make the damper loss of elasticity. It is suitable for all kinds of temperature and pressure of gate valves. Wedge double wedge type gate: the sealing surface of machining precision request is low, easy to seal, the temperature change is not easy to cause jam and abrasions, convenient maintenance after sealing surface wear. But the structure is more complex, parts, valve size and weight is bigger. Parallel type single ram: simple structure, can't on its own to achieve forced sealing, in order to ensure its tightness, generally USES the soft sealing of fixed or floating, suitable for medium and low pressure, large, medium, and medium such as oil or coal gas and natural gas. Parallel-type double ram: general sealing force through the upper beam, relative movement between the sealing surface is small, not easy scratches, more than gate valves for low pressure, medium and small size.
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