The advantage of gate valves which has a flexible wedge for mounting from the pipeline from aoaltwar's blog

A Gate valve is usually a linear motion on-off or shut-off valve. The gate-valve consists of a disc or wedge having two seating surfaces which come in contact with all the valve seats to create a seal for stopping the flow check here. The pressure differential between your upstream flow direction and downstream side of wedge causes the wedge or disc to push against the downstream seat creating more effective sealing for the downstream side from the wedge. Gate valve just sits there to regulate flow as erosion of disc and seat could potentially cause leakage. A gate valve in partially open or closed position can also be susceptible to vibration.

The shut-off part on the gate valve was made in the form of any wedge, which is often flexible, with multiple plates or rigid.

Let us check out each on the subcategories:
Rigid wedge
To ensure a higher hermiticity of gate valves, it's advocated to choose a stiff wedge. In this case, you have to pay attention towards the accuracy of wedge processing, that permits to coordinate the seat angle with all the wedge angle without obstacles. In addition to that, rigid wedge application could potentially cause dangerous events like gate jamming, or there might be problems while using opening of gate valves regarding temperature fluctuations, corrosion build-up or sealing damages.

Wedge with 2 plates
The wedge is made up of several plates that are securely guaranteed to each other and therefore are situated with an angle. Thanks to self-adjustment, the problem from the gate hermiticity within the closed position could be avoided.

Flexible wedge
Connected having an elastic part, the plates can clamp down and help the sealing tightness in closed position. The advantage of gate valves that has a flexible wedge for mounting within the pipeline is the fact that there is no need of your complex adjustment on the valve body.

The varieties of rising-stem gate valve could be divided into wedge disc gate valve and parallel disc gate valve in line with the sealing surface configuration. Wedge disc gate valve is usually divided into: single disc type, double disc type and elastic disc type; parallel disc Type gate valve could be divided into single disc type and double disc type. According for the thread position in the valve stem, it may be divided into rising-stem gate valve and non rising-stem gate valve.

When the rising-stem gate valve is closed, the sealing surface can just rely within the medium pressure to seal, that may be, only rely within the medium pressure to press the sealing surface on the disc on the valve seat within the other side so that the sealing from the sealing surface, that's self-sealing. Most gate valves adopt forced sealing valve, that is certainly, once the valve is closed, the disc need to be forced to your valve seat by external force so that the tightness from the sealing surface.