Electric gate valve opening and closing is ram, ram movement direction and perpendicular to the direction of flow of electric gate valve can only be fully open and close, not to adjust and throttling. Sealing face has two gate, two of the most commonly used mode gate valve sealing surface form a wedge, the wedge Angle vary with the valve parameters, usually in the form of 50, when the medium temperature is not high for 2 ° 52 & # 39; 。 Wedge gate valve of the damper can be made into a whole, is called a rigid disc; Can also make it generates trace of deformation of ram, in order to improve the manufacturability, make up for the sealing surface Angle in the process of our processing deviation, this damper is called elastic disc. Electric gate valve type, according to the sealing surface configuration can be divided into wedge type gate valve and parallel sluice gate valve gate, wedge gate type gate valves can be divided into: single gate type, double disc and flexible disc; Parallel slide gate valve can be divided into single ram and double ram. According to the threads of the valve stem position, can be divided into rising stem gate valves and dark bar gate valve two kinds. Gate valve is closed, sealing surface can only rely on medium pressure to seal, that depend on 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. Electric gate valve gate, linear motion, with the stem called lifting lever gate ( 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 valve 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 - back 1, 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, the valve stem nut is located in the gate, the hand wheel rotation drive the valve rod rotation, and make the disc, the valve is called rotating lever gate or non-rising stem gate valves. Electric gate has the following advantages. 1. Fluid resistance small, sealing surface Chong brush and erosion by the medium. 2. Open and close more effort. 3. Medium flow direction is not restricted, disturbed flow, reduce the pressure. 4. Shorter form, simple structure, good manufacturing technology, wide application scope. Gate valve faults are as follows: 1. Easy cause erosion and abrasion, surface maintenance more difficult. 2. Dimension is bigger, open needs certain space, open and close time is long. 3. The structure is complex. Electric gate Industrial Valves installation and maintenance should be paid attention to the following: 1. The handwheel, handle and transmission mechanism are not allowed for lifting, and collision is forbidden. 2. Double disc gate valves should be installed vertically ( The stem in a vertical position, the handwheel at the top) 。 3. Gate valve with a bypass Industrial Valves in open open the bypass valve should be taken before, To balance the import and export of pressure difference and reduce the opening force) 。 4. Belt transmission mechanism of the gate, according to the regulations of the product instruction manual installation. 5. If the valve switch is used, often lubrication at least once a month. Seal gate valves of the elastic base seat features: on the market for a long time to use a common general electric gate valve is leaking or rusty phenomenon, the company introduced the European high-tech rubber and valve manufacturing technology of elastic seat seal gate valves, overcome the general gate seal bad, rust and other defects, seal gate valves of the elastic base seat using elastic disc produce elastic deformation compensation effect to achieve good sealing effect, this valve has the switch light, reliable sealing, good elastic memory and the service life and other significant advantages.
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