Figure 2 - 51 shown in valve is specially designed for medium backflow system very quickly. The valve adopts the deceleration damping device, this device at the end of the closing stages. In addition, this valve has adopted must be closed in the shape of parts, so this kind of check valve impact pressure is small. Y type check valve is introduced in comparison with other types of check valve and lift check valve lift the shortest, and lift check valve may be quickly close the valve. However, if the dirt into the shut down the movement of the steering mechanism, the close may be stuck or slow. In addition, if used in viscous medium, has closed a movement may be slower in the guide rail. Figure 2 - 52 shown in spherical disc lift check valve is an exception, the valve in a spherical disc and its steering mechanism between the larger gap, thus where dirt is very durable. Vertical check valve is introduced as shown in figure 2 - (2) swing check valves 53, as shown in the disc disc, disc around the seat channel external rotation of the fixed axis. Swing check Industrial Valves by valve body, valve cover, valve and rocker arm; The valve channel streamlined, fluid resistance is small. In the high temperature and high pressure check valves can be used without flange pressure seal structure, sealing ring forming flexible graphite packing or with stainless steel car, tight seal ring to achieve sealing medium pressure, the higher the medium pressure sealing performance, the better [ Figure 2 - 53 ( b) ] 。 Swing check valves

The , essentially perfected by os&y valve, is one of the first home appliance to be widely distributed.
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The best way of os&y gate valve is to get a cast iron valve double flanged gate valve.