Valve conditions and operation of the application

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 slight 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 travel> to determine.

1. Gate valve is usually applied to open - close the occasion, can not be used for throttling applications.

2. Gate valve is usually installed in the horizontal pipe, stem vertical upward. It can also be mounted on a vertical pipe or a horizontal pipe with a stem that is not vertically upright, but depending on the size of the valve, the application environment and the specific material conditions, special constructions may be required. If the valve to be purchased is intended for a special installation, the orientation of the valve should be stated when ordering.

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. This can happen when the valve is cold and then warm.

4. For use in high-speed fluid (turbulent flow) or thermal cycling applications, the threaded seat ring should be keyed to the valve body to avoid loosening. Please specify when ordering.

5. After closing the gate valve, the stem should be slightly rotated (1/8 to 1/4 turn) to release the stem load. This allows the valve stem to expand slightly without clogging or damaging the valve and without affecting the closing effect.

6. If the seat ring mounting lugs are removed, the highly integral shut-off valve can be used in hot water outlets or in ducted systems with soft iron. Please specify when ordering.

7. The pump station is not subject to site restrictions, more debris in the water, easy to plug the important position of the valve, flashlight dual gate valve can be used; the other can be used butterfly valve, especially in the pumping station renovation project can be used in the butterfly valve in order to effectively use The original pump room space, to achieve the same premise in the original pump room to increase (row) water purposes.

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