| Model： | ||
| Standard or Nonstandard： | Standard |
|
| Pressure： | HighPressure |
| PriceRange： | ||
| Structure： | Other |
|
| Port Size： | 2"-24" |
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Piston check valve has an internal piston that moves inside of a sleeve (liner). The piston rings are similar to those used on automotive pistons. In order to take effects, the piston has a tapered metal seal area which seats against a removable metal seat that is threaded into the valve body.
The operation of the piston check valve depends mostly on the flow pressure difference, which is also called the pressure drop. As upstream pressure and flow become greater than downstream pressure, the piston begins to lift off of the seat and slide up into the liner. Afterwards, the fluid in the chamber on top of the piston begins to compress and the compressed fluid would prohibit further lifting of the piston. If there were not ball check valves installed in the top of it. This small spring loaded check valves are forced open by the compressing fluid trapped above the piston. As they open, fluid is allowed to escape letting the piston continue to travel upward. Once the driving force equalizes, the piston stops rising and the ball checks close.
At this time, gravity and/or a spring begin to push the piston back down towards the seat. An orifice plug is needed to be installed on the top of the piston to overcome the vacuum during the travelling down. The orifice plug does help to allow fluid to meter into the chamber above the piston letting it descend slowly. As a result, it can prevent the piston from slamming against the seat. Normally, before the piston contacts the seat, the next pulse enters the valve starting the whole cycle over. When flow stops, the piston will then contact the seat and any backflow pressure forces the piston seal surface tightly against the seat, preventing reverse flow.
Piston check valve features at the piston which has provided a lot of convenience during the whole operation. Generally speaking, the piston check valve provides back flow control for piping systems. As a result, the piston check valve is classified to the “non slam” check valves. Besides, the piston check valve is designed specifically for use on the discharge of reciprocating compressors or any service with pulsating flow, as well as being used successfully in non-reciprocating service.
Similarly to other carbon steel weld end valves, the piston check valves have weld end connections. The cast bodies are designed according to certain standards. And the end preparations are made in order to match specified mating pipe bores.
Located on the valve cover plate, the nameplate on the piston check valves indeed provide applicable information including size, pressure class, materials, pressure/temperature, ratings and serial number. As a result, you can use the chosen piston check valves well in order to make benefits. And it is possible for you to make contacts if it is necessary.
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