Check valve pvc

Check valve pvc DEFAULT

Check valves


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Sours: https://www.cepex.com/products/check-valves/

Check Valves

Check valves are self-contained, automatic valves, which are used to prevent the reversal of flow in a line. When open and under flow pressure, the checking mechanism will move freely in the media, offering very little resistance and minimal pressure drop. Asahi/America provides two basic types of check valves: swing check valves and ball check valves. A swing check valve utilizes a swinging disc, which requires only minimal back pressure to close the valve. This valve can also be modified, with a lever and weight or spring, to assist in seating faster to eliminate shock. The Asahi/America ball check valve employs a free moving ball, which unseats to permit flow in one direction, but seals against a seat to prevent backflow. Both types of valves may be installed vertically or horizontally.


Ball Check

BallCheckValves

Applications:

Chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools, power plants

 

Size:

True Union: 1/2" - 2"
Single Union: 3" - 4"

Bodies Materials:

PVC, CPVC, PP and PVDF

Seat & Seals:

EPDM, FKM, PTFE

Models:

Socket, Threaded, Flanged, Butt End


Swing Check

swing-check-valve

Applications:

Tank inlets/outlets; preventing backflow into a pump; one-way mixing; water hammer mitigation; pressure balancing; process intakes. In the following industries: chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools, power plants

Sizes:

3/4" – 8"

Body:

Hi-PVC, PP, PVDF

Seat & Seals:

EPDM,FKM,PTFE

Models:

Flanged Connection Only


Wafer Check

Wafer Check Valves

Applications:

Tank inlets/outlets, preventing backflow into a pump, one-way mixing, water hammer mitigation, pressure balancing, process intakes.

In the following industries: chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools, power plants

Sizes:

3” - 12”

Bodies:

PVC

Seals:

EPDM or FKM

Models:

Wafer Style


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Sours: https://www.asahi-america.com/valves-and-actuation/manual-valves/check-valves
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PVC Ball Check Valves

PVC check valves come in true union ball check, wafer check and swing check designs. All offer the benefits of PVC, including its durability and corrosion resistance. True union ball check valves have a metal or ruby ball that turns flow on and off when the pressure inside the valve reaches a certain point. The pressure pushes the ball into the "off" position. Because these valves can be quite small, they are used in microelectronics, but also may be used in chemical processing, water treatment and chemical cooling processes.

Swing check valves contain a disk on a hinge that swings into place to stop reverse flow. They, like the ball check valves, are designed to work without human intervention. They are larger in size than ball check valves, so they are commonly used in larger applications, like the flapper in a home toilet, which opens is automatically held in the "off" position unless someone flushes and opens it. They may also be used in fire safety systems and firefighting equipment.

Wafer check valves are used in situations where the valve needs to open and close quickly. These valves, which are also called dual plate check valves, have a pair of plates that come together to stop the flow quickly. The plates stop flow automatically when the pressure in the system reaches a certain point.

Sours: https://www.pvcfittingsonline.com/valves/pvc-check-valves.html
Different Types of Check Valves

PVC Swing Check Valves

These valves come in a range of diameters from 2 1/2 inches to 8 inches to accommodate systems of many sizes. All are made form durable PVC to offer the benefits of this corrosion resistant, pressure resistant material. This means they can be used indoors and outdoors, in systems using everything from plain water to corrosive chemicals. PVC swing check valves are commonly seen in pumping systems where backflow would damage expensive components. These valves are equipped with EPDM seals and socket ends, which makes installation simple. Customized ends or sizes may be available by custom order.

Swing check valves contain a flap or disc inside the valve that is the same diameter as the interior diameter of the pipe. This flap or disc hangs down to block the flow of the liquid. When fluid flows through the valve in the forward direction, the pressure of the fluid lifts the flap out of the way, allowing the liquid to flow. The hinge pin at the top of the valve ensures that the flap closes when the flow stops, with the weight of the flap itself holding the valve closed. Any backward flow is immediately stopped. All of this happens automatically, so there is no work on the user's part required to make the valve function properly. This process does create turbulence in the fluid because the flap sits on top of the flowing liquid, which creates a larger pressure drop than other valve types.

Sours: https://www.pvcfittingsonline.com/valves/pvc-swing-check-valves.html

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