Gate valve Introduction: gate valve opening and closing pieces is the gate, gate direction of the flow and fluid 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 sealing surfaces of the most commonly used gate valves form a wedge. The wedge angle varies from valve to valve, typically 50, with a 2 ° 52 'medium temperature. Wedge gate valve gate can be made as a whole, called the rigid gate; can also be made to produce a small amount of deformation of the gate, to improve its technology to make up for sealing surface angle in the process of deviation, this gate The board is called a flexible gate. Gate valve is closed, the sealing surface can only rely on medium pressure to seal, that is, rely on media pressure to the sealing surface of the gate pressure 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 seal, that is, when the valve is closed, it must rely on external force to force the gate to the valve seat to ensure the sealing surface of the seal. Gate valve gate with the stem for linear motion, called lifting rod gate valve (also known as rod gate valve). Trapezoidal thread is usually on the lifting rod, through the valve at the top of the nut and the guide groove on the valve body, the rotary motion into a linear motion, that is, the operating torque into the thrust. When the valve is opened, the fluid path is completely clear when the ram height is equal to 1: 1 of the valve diameter, but this position can not be monitored during operation. The actual use is based on the top of the valve stem as a sign, that is, an open position, as its fully open position. To consider the temperature change lock phenomenon, usually in the open to the top position, and then back 1 / 2-1 lap, as a fully open valve position. Therefore, the valve fully open position, according to the gate position (ie stroke> to determine. Some gate valve, the stem nut is located in the gate, the hand wheel rotates the valve stem to rotate, leaving the ram to lift, this valve Known as the rotating rod valve or dark rod gate valve. Gate valve has the following advantages: fluid resistance is small, the sealing surface of the media by the brush and erosion of the small. Opening and closing more effortless. Unrestricted flow of media, does not disturb the flow, does not reduce the pressure. Simple, short structure length, good manufacturability, wide range of application. The disadvantages of gate valve are as follows: easy to cause erosion and abrasion between sealing surfaces and difficult to maintain. Large dimensions require a certain amount of space for opening and closing Long. The structure is more complex. Zhaku wide variety, according to the sealing surface configuration can be divided into wedge gate valve and parallel gate valve, wedge gate valve can be divided into: single gate, double gate and flexible gate Plate type; parallel gate valve can be divided into single-gate and double gate type. According to the thread position of the stem can be divided into open rod gate valve and the dark gate valve two. Gate valve installation and maintenance should pay attention to the following things Items: 1. Handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is prohibited. 2. Double gate valve should be installed vertically (ie the stem is in vertical position with handwheel at the top) The valve of the valve should be opened before opening the bypass valve (in order to balance the pressure difference between the import and export and reduce the opening force.) 4. With the gear valve, according to the instructions of the product installation 5. If the valve often switch Use, Lubricate once a month at least. Gate Valve Category: Flat Gate Valve Knife Gate Valve Elastic Block Gate Valve Electric Gate Valve Soft Seal Gate Valve Forged Steel Gate Valve Wedge Gate Valve Gate Valve Dark Rod Gate Valve Pneumatic Gate Valve Bellows Gate Valve Power Station Gate Valve High Pressure Gate Valve Water Seal Gate Valve Signal Gate valve slag discharge valve low temperature valve welding gate valve lining fluorine valve thermal insulation valve. Zhejiang 赛 high Valve Co., Ltd. Service Tel: (0) Direct Hotline: Fax: QQ: E-mail: zjsgvalves @ 126. com
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