There are many kinds of check valves, including swing check valves, double-lobe clamp check valves, silence check valves, slow-closing check valves, double-lobe clamp check valves and so on. In the previous articles, we introduced the swing check valve, the lifting check valve, and the double lobe clamp check valve, in this article we will introduce in detail the slow closing check valve, this check valve is often used in the pump, the following models will often be confused, this article by using the animation work to introduce the difference between the slow closing check valve.

HH44X rotary opening slow-closing check valve, its architecture is very simple, composed of single-lobe rotary opening type plus balance hammer and hydraulic damping, horizontal installation, vertical installation can be used, suitable for large flow, high head, high water hammer risk system, but the disadvantage is long structure, large volume, large weight.

HH49X butterfly double-lobe micro-resistance slow-closing check valve, its structure is composed of butterfly double-lobe plus spring return and hydraulic damping, only suitable for horizontal installation, short structure, small size and light weight.