Gate valve is the closing member (gate) along the centerline of the vertical movement of the valve. Gate valve in the pipeline can only be fully open and all off with off, not for regulation and throttling. Gate valve is the use of a wide range of valves, the general diameter DN ≥ 50mm cutting devices are used it, and sometimes a small caliber shut-off device is also used gate valve. 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.) 1. Gate valve is usually used in open-closed occasion, can not be used for throttling applications. 2. Gate valve is usually installed in the horizontal pipe, the valve stem Vertical up. Can also be installed in the vertical pipe or the valve stem is not vertical upward on the horizontal pipe, but according to the size of the valve size, the application environment and the specific circumstances of the material may require special structure.If the purchase of the valve ready to use special When ordering, the orientation of the valve should be stated. 3. For applications where the temperature exceeds 260 ° C, a flexible or split wedge gate is recommended to prevent the wedge gate from becoming stuck due to thermal expansion. It may occur when the valve is cold-closed and then warm-open. 4. When used in high-speed fluid (turbulent) or thermal cycling applications, the threaded seat ring should be keyed to the valve body to avoid loosening. Description 5. After closing the gate valve, the stem should be slightly swung (1/8 to 1/4 turn) to release the stem load This allows the stem to expand slightly , Will not get stuck or damage the valve, and will not affect the closing effect. 6. If you remove the seat ring mounting lugs, the highly integrated shut-off valve can be used in hot water outlet or soft iron pipe system. Please specify when ordering 7. Pumping station is not subject to site restrictions, more debris in the water, easy to plug the important position of the valve, dual-use flashlight valve can be used; the other can be used butterfly valve, especially in the pumping station renovation project The butterfly valve can be used in order to effectively utilize the space of the original pump room to achieve the purpose of increasing the water supply and discharge volume under the premise of unchanged original pump room area.
Custom Size Steel Sectional Garage Door Lifting Commercial Use
sectional garage door,lifting door,overhead garage door
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