Ball valve function pdf

The valve appearance is equal and neat and manufacturing friendly. The disadvantage is due to flanged end will increase the weight. Ball Valve structure and working principles. Ball valve is mainly constructed of valve body, seat, ball, valve stem, handle or other driving device. The ball valve uses a ball with a round through hole as the opening and closing part.

The ball rotates with the valve stem to achieve the opening and closing action. The main function of the ball valve is to cut off or connect. Ball Valve Design Standard and Application. Through 60 In. ASME B At present, the sealing surface material of ball valves is widely used plastic, which has good sealing performance. It can achieve complete sealing, zero leakage, and has been widely used in vacuum systems. Suitable for as a remote valve.

Hence sealing surface will not be easily contaminated and eroded. Maintenance of ball valve. Only one operator is allowed to operate. Excessive pressure and force are not permitted when operating the valve. For valves that are not operated for a long time or used in low temperature environments, there may be problems with foreign material accumulation or jam in the valve. Before operating the ball valve, you should first Inject a small amount of cleaning fluid or grease to protect the valve seal.

Ball Valve Selection guide. For piping systems and devices of low-temperature media, low-temperature ball valves with extended bonnets should be selected. In the equipment and piping system of corrosive media such as acid and alkali in the chemical system, it is appropriate to select a full stainless steel ball valve made of austenitic stainless steel with PTFE as the seat ring.

When flow adjustment is required, worm gear drive, pneumatic or electric adjustment ball valve with V-shaped opening can be selected. NTGD Valve is a professional ball valve manufacturer , feel free to contact us if you have any inquiry. China Email: sales ntgdvalve.

This design makes them suitable for larger-bore and higher-pressure operations as well as reduces valve torque because the ball is supported in two places. The trunnion-mounted stem absorbs the thrust from the line pressure, preventing excess friction between the ball and seats; therefore, at full-rated working pressure, operating torque remains low.

These ball valves deliver maximum strength and resistance to pipeline pressure and stress. Plus, their compact, spherical design also eliminates body flanges, thus reducing overall size and leak paths. Floating ball valves are attached only to the stem, not held in place by a trunnion. This sometimes causes the ball to float slightly downstream, which then causes the ball to press against the seat, creating a positive seal.

Rising stem ball valves incorporate tilt-and-turn operation, eliminating seal rubbing—one of the primary causes of valve failure. When the valve is closed, the core is wedged against the seat, ensuring positive shutoff. When the valve is open, the core tilts away from the seal, and flow passes uniformly around the core face.

ORBIT rising stem ball valves leverage this operating principle, delivering fast, low-torque operation and long-term, reliable performance. They also eliminate localized high-velocity flow, which can create uneven seat wear in conventional ball, gate, and plug valves. In a hydraulic circuit, the pressure fluctuates across the load, sometimes more or less.

Although the inlet pressure is constant, the pump is delivering fluid at constant pressure but the outlet pressure can vary.

To avoid this fluctuation in load we can easily install a pressure compensated flow control valve. By using this flow control valve, the flow rate can be kept constant even under variable loads.

These valves have a spool and by changing the position of the spool, the field direction of the passage can be adjusted. Therefore, the required flow can be maintained during the flow of the fluid through the control valve.

The valve controls the flow of the oil in a pipe by moving a flat plate called a gate or disc valve. Gate is built perpendicular to the length of the pipe with the help of a handwheel. This mechanism is achieved by connecting the gate with the handwheel through a threaded spindle that rotates in the valve body.

The advantage of a gate valve is that it offers little or no resistance to flow when it is fully open. It is usually made up of gunmetal. As the name suggests, this valve is having a plug. This plug can be turned to move its ports to control the flow of oil and it features to reduce the friction between the plug face and the body seat when the turning of the plug. The valve consists of a tapered wedge mechanically seated in the body.

The tapered edge has a rectangular window. When the valve is fully open rectangular window aligns itself with the holes running through the valve body. It is a kind of screw-down stop valve.

Its use is restricted to small sizes which have the body ends in line or right angles with each other or maybe oblique type. Here disc is in the form of needlepoint. By rotating the handwheel, the tapered needle advances, and the area of the valve seat decreases. Hence the oil flow is gradually reduced. These valves are used in hydraulic systems in lines of delicate pressure gauges. The non-return valve permits flow in one direction and stops the flow completely in one direction and stops the flow completely in one direction.

It consists of a valve body, a poppet, a spring, and a seat. When the force of fluid is available at the inlet port exceeds the strength of the spring and the backpressure of oil the poppet is pushed up and the valve opens to permit the flow through it.

When the oil is flow is reversed, the valve piston is pushed back to its seat, completely blocking the flow. Due to the extremely long durability of our ball valves, the end user benefits not only with quality but also with lower maintenance costs. We have a solid working knowledge about the design of ball valves and the materials needed in their construction.

Cryogenic Top Entry Ball Valves. Cryogenic Split Body Ball Valves. Cryogenic End Entry Ball Valves.