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The types of check valves [2011-01-10]

To allow a ball valves in the forward position open and closed positions to block the reverse current.

A ball valve is a valve in the sealing element, the movable part to block the river, is a ball. In some ball, the ball with a spring to close. On models without return spring is necessary to move the ball toward the seat and a seal. The inner surface of the main squares of the ball check valves are more or less conically-tapered to guide the ball into the seat and form a positive seal to leave behind.
Although the balls are usually metal, that may be made of different materials, or in some cases artificial ruby. HPLC high pressure pumps and similar applications typically use small inlet and outlet valves with ball check ball artificial ruby and seats of artificial sapphire, both for its hardness and chemical resistance. After prolonged use can lead to valves or the office may develop a crack, a replacement. Therefore, these valves are manufactured to be interchangeable, sometimes in a small sealed plastic cover to withstand the internal pressure metal accessories attached, high blood pressure, and is screwed into the pump head.

There are similar check valves the disc is a sphere, but a different way, like a cone with a spring tension.

Ball valves should not ball, which acts as a kind of valve in which a ball as a controllable rotor to stop or be confused with debit.

A diaphragm valve uses a rubber membrane curvature in a position to provide a normally closed valve. The pressure must be greater than the pressure on the upstream side to downstream of a certain amount, because the pressure difference is known to open the flow control valve. After a positive pressure, the membrane stops automatically returns to its original closed position.

A check valve or valve tilting disc valve in which the disk to block the flow moving, changing a hinge or pivot block, either in the back seat or let the front seat. The seat opening cross section is perpendicular to the midline between the two ports or at an angle. Although the check valves may come in different sizes, valves are often large swing check valves. The mechanism of the discharge valve is an example of this type of valve. The pressure in the container, which closed is overcome by the manual lifting of the drum. Remains open until you empty the tank and the lid falls by gravity. Another variant of this mechanism is the flapper valve, which is used in applications such as fire safety systems of life. A door opens only in the inbound direction. Valve seat is often a spring so that the door is closed when the pressure is haste.

A check valve is a valve with flow control are independently stop the flow direction or pressure. In addition to closing in response to pressure from reflux or poor, can be disabled intentionally by an external mechanism, so that no flow independent of pressure up front.

A check is a check-valve disk, sometimes a lift, he rose from his seat by higher pressure inlet or upstream fluid to flow out or the downstream side to permit. A guide follows the movement of the disk in a vertical line, the valve can be set correctly. When the pressure is higher, the severity or requires greater emphasis on the disc in your seat and close the valve to stop investing.

A valve is a check valve duckbill in which the flow passes through a flexible tube into the downstream side. Pressure flow tube is not cut.

Several valves can be connected in series. For example, a double check valve is often referred to as the backflow of potentially contaminated water in the new vacuum lines used in municipal water. There are also two ball check valves ensure that there are two seats combination of ball and / or sequentially in the same body in a tight reverse switch when the block valves and check valves, angle valve and ball cone.