The check valves on this steam locomotive are located under the small cover between the chimney and the main dome.Check valves are often used with some types of pumps. Piston-driven and diaphragm pumps such as metering pumps and pumps for chromatography commonly use inlet and outlet ball check valve.

A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a ball. In some ball check valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal.

The valve flap of the swing check valve is disc-shaped and rotates around the shaft of the valve seat passage. The flow passage is streamlined and the flow resistance is smaller than that of the butterfly check valve. It is suitable for low flow rate and irregular flow.

The swing check valve is also called a check valve or a check valve, and its function is to prevent the medium in the pipeline from flowing backward. The valve of the opening and closing member is opened or closed by the medium activity and force to prevent the back flow of the medium.

A swing check valve or tilting disc check valve is a check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow.

A trunnion ball valve has additional mechanical anchoring of the ball at the top and the bottom, suitable for larger and higher pressure valves (say, above 10 cm and 40 bars). A floating ball valve is one where the ball is not held in place by a trunnion.

Ball valve Daily maintenance is very importance,With a long service life and maintenance-free period, it will depend on several factors: normal working conditions, maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data. When the ball valve is closed.

There are Installation instruction and use for ball valve,before installation should check and confirm the environment’s conditions and take care for ball valve when operating it.1. Indoor equipment or outdoor applications with protection methods;2. Outdoor open-air installations, with wind, sand, r

There are five general body styles of ball valves: single body, three-piece body, split body, top entry, and welded. The difference is based on how the pieces of the valve—especially the casing that contains the ball itself—are manufactured and assembled.

Valves such as globe valve, check valve, gate valve, throttle valve and reducing valve all have directivity.If installed in the opposite direction, throttle valves' operation performance may be weakened and service life may be shortened; reducing valves may have no effect.