Gate valve only for full open, all off all types of pipe or equipment on the use of the media, not allowed for throttling. With the hand wheel or handle the gate valve, the operation shall not increase the auxiliary lever (if the seal is not strict, you should check the repair seal surface or other parts). Handwheel, handle clockwise to turn off, otherwise open. The gate valve of the transmission mechanism shall be used in accordance with the provisions of the product manual.
Gate valve opening and closing parts is the gate, the direction of movement of the gate and the fluid direction perpendicular to the gate valve can only be fully open and fully closed, can not be adjusted and throttling. The gate has two sealing surfaces, the two most commonly used mode gate valve sealing surface of the wedge, wedge angle with the valve parameters vary, usually 5 °, the medium temperature is not high when the 2 ° 52 '. Wedge gate valve can be made into a whole, called the rigid gate; can also be made to produce trace deformation of the gate to improve its craft, to make up the sealing surface angle in the processing of the deviation, The plate is called a flexible gate. When the valve is closed, the sealing surface can only rely on the media pressure to seal, that is, rely on the media pressure to the gate of the sealing surface to the other side of the valve seat to ensure that the sealing surface of the seal, which is self-sealing. Most of the gate valve is forced to seal, that is, when the valve is closed, to rely on external force forced to the gate pressure to the valve seat to ensure that the sealing surface of the seal. Gate valve with the stem with a straight line for movement, called the lift bar gate valve, also called the gate valve. Usually in the lift bar with trapezoidal thread, through the top of the valve nut and the valve body on the guide groove, the rotary motion into a linear motion, that is, the operating torque into the operating thrust. When the valve is opened, when the height of the gate is equal to 1: 1 times the diameter of the valve, the fluid channel is completely open, but this position can not be monitored during operation. The actual use of the stem is the vertex as a sign, that is, the location of the open, as its full open position. In order to consider the temperature changes appear locking phenomenon, usually in the open to the vertex position, and then back 1 / 2-1 circle, as the full valve position. Therefore, the valve fully open position, according to the location of the gate that is to determine the trip. Some gate valve, stem nut set on the gate, hand wheel rotation to drive the stem rotation, leaving the gate to lift, this valve is called the rotary bar gate valve, or called the dark bar gate valve.
Light weight: the body made of advanced ductile iron, weight lighter than the traditional valve weight reduction of about 20% to 30%, easy installation and maintenance.
Flat gate: the traditional gate valve is often in the water after the washing tube because of foreign objects such as stone, wood, cement, iron, debris and other silt in the bottom of the groove, easy to cause close to the formation of water leakage phenomenon, Elastic seat seal valve at the bottom with the same pipe with the flat design, not easy to cause debris deposition, so that fluid unimpeded.
The overall package of plastic: the use of high-quality rubber plate for the whole body, outsourcing plastic, the European first-class rubber vulcanization technology makes the curing of the gate to ensure accurate geometric dimensions, and rubber and ductile castings and then firmly, Elastic memory good.
Casting body: the valve body with precision casting, accurate geometry makes the valve body without any finishing to ensure that the valve seal.
The closing member (shutter) is moved in the vertical direction of the passage center line to be fully open and fully closed.
Gate valve is mainly used for cutting off or connected to the pipeline in the medium, generally not as a regulator or throttling use.
Gate valve according to the classification method can be divided into: parallel gate valve, wedge gate valve, lift gate valve, rotary rod type gate valve, quick opening and closing gate valve, shrink gate valve, flat gate valve.
Fluid resistance is small, the applicable pressure, temperature range, medium flow direction is not limited, good sealing performance.