Flange Shutoff Valve is a valve in which the closing part (valve flap) moves along the centerline of the valve seat. According to this way of valve flap movement, the change in valve seat opening is proportional to the valve flap travel. As the stroke to open or close the valve stem of this type of valve is relatively short and has a very reliable closing function and as the change in seat opening is proportional to the flapper stroke, the flanged ball valve is ideal for regulating flow. The flanged ball valve is therefore ideal for shutting off or regulating and throttling.
The working principle and characteristics of flange block valve
As an extremely important shut-off valve, the flanged ball valve is sealed by applying torque to the stem, and the stem applies pressure to the valve flap in the axial direction, so that the sealing surface of the valve flap and the sealing surface of the seats of the valve are close to each other to avoid leakage of the medium along the To avoid gaps between the sealing surfaces.
The flange valve sealing pair consists of the valve flap sealing surface and the valve seat sealing surface. The stem causes the valve flap to move vertically along the centerline of the valve seat. During the opening and closing process, the opening height is small, easy to regulate by flow rate, and easy to manufacture and maintain, with a wide pressure application range.
The advantages and disadvantages of flanged shut-off valve
A. Flange block valve has the following advantages:
- Simple structure, more convenient to manufacture and repair.
- Small working stroke, short opening and closing times.
- Good sealing, low friction between sealing surfaces and long service life.
B. The disadvantages of flange block valve are as follows:
- The resistance to the fluid is high and the effort required to open and close is greater.
- Not suitable for media with particles, high viscosity and easy coking.
- Poor adaptation performance.
NTGD Valve is professional Flange Lock Valve Manufacturer Please feel free to contact us if you have any questions.
