Gate valve of the headstock is the gate, the movement direction of the gate and the direction of the fluid perpendicular to the gate valve can only be fully open and full clearance, can not be adjusted and throttling. The gate has two sealing surface, the most commonly used mode gate Valve's two sealing surface forms the wedge, the wedge angle varies with the valve parameter, usually is 50, the medium temperature is not high when is 2°52 '. Wedge Gate valve can be made into a whole, called a rigid gate, can also be made to produce a small amount of deformation of the gate, in order to improve the process, to make up for the angle of the sealing surface in the processing of the deviation, the gate is called Elastic Gate.

The type of gate valve, according to the sealing surface configuration can be divided into wedge-type gate gate valve and parallel brake plate gate valve, wedge-type gate gate valve can be divided into: single brake plate, double brake plate and elastic brake plate, parallel gate gate valve can be divided into single brake plate and double brake plate. According to the thread position division of the stem, can be divided into the Ming-pole gate valve and the dark-stem gate valve two kinds. When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate is pressed to the other side of the valve seat to ensure the seal of the seal surface by the medium pressure, which is the self sealing. Most of the gate valve is a forced seal, that is, the valve closed, to rely on external forces to force the gate pressure to the seat to ensure the sealing surface of the seal.

Gate valve of the gate with the stem for linear movement, called the Lift Bar Gate valve (also known as the Ming stem Gate valve). Usually on the lifter has trapezoidal thread, through the top of the valve nut and valve body on the guide groove, the rotation of the movement into a straight line movement, that is, the operation torque into operation Thrust.

When opening the valve, when the gate lifting height equals valve diameter 1:1 time times, the fluid channel is completely unimpeded, but at run time, this position is unable to monitor. In actual use, it is the vertex of the stem as a sign, that is, the position of the open, as its full opening position. In order to consider the temperature changes in the deadlock phenomenon, usually open to the vertex position, and then back to the 1/2-1 ring, as the position of full opening valve. Therefore, the full open position of the valve is determined by the position of the gate (i.e. itinerary). Some gate valve, the stem nut is located in the gate, the handwheel rotates to drive the stem to rotate, but causes the gate board to ascend, this kind of valve is called the Rotary Pole Gate valve or is called the Dark pole gate valve.

Gate valves have the following advantages

1. The fluid resistance is small, the sealing surface is subjected to the medium 忡 brush and the erosion is small.

2. Opening and closing more labor.

3. The medium flow is unrestricted, does not disturb the flow, does not reduce the pressure.

4. Simple form, short structure length, good manufacturing process and wide application range.

The disadvantages of the gate valve are as follows:

1. The seal surface is easy to cause the erosion and the abrasion, the maintenance is more difficult.

2. Large size, open need a certain space, opening and closing time is long.

3. The structure is more complex.

The installation and maintenance of gate valve should pay attention to the following matters: 1. Handwheel, handle and transmission mechanism are not allowed for lifting, and is strictly prohibited collision. 2. Double gate gate valve should be installed vertically (that is, the stem is in the vertical position and the handwheel is at the top). 3. Valve with bypass valve should be opened before opening the bypass valve (in order to balance the import and export pressure difference and reduce the opening force). 4. With the transmission mechanism of the gate valve, according to the specifications of the product installation. 5. If the valve is often used, lubricate at least once a month.

Resilient Block Gate valve features: A long time in the market commonly used in the general gate valve leakage or rust phenomenon, the introduction of European High-tech rubber and valve manufacturing technology produced by the elastic block gate valve, overcome the general gate valve seal bad, rust and other defects, Resilient block gate valve The compensating effect of the elastic gate to produce micro-elastic deformation has achieved good sealing effect, which has the advantages of light switch, reliable sealing, good elasticity memory and service life.