Damper valve construction

The main components of damper valve are in the body, here it is present a flap valve that rotates on two axes properly aligned. The axis of rotation is located on the central planes, in a sense is a bi-directional valve. The tightness of these valves between the 97% and 99%. If the body is designed without closing the bands, the seal will be of 97%.

 

However, if the half-moons are welded to the closure you can obtain a greater watertight. There is also the possibility of mounting a system of seals on the half-moons, to reach up to 99% seal watertight. In the case where it is necessary a seal whit  a effect of 100%, the design of the valve It will be adapted to the needs of various types than the standard.