Description

A ball valve is a globe valve that permits, stops, and controls the flow of liquids, gases, and vapors in a piping system by rotating a perforated ball inside the valve. The ball is mounted on two bases and has a shaft that connects the ball to an operating and control mechanism that rotates the ball. Fluid is not allowed to pass through the valve when the cross-section of the hole is perpendicular to the flow area. Fluid flows through the valve and the fluid flow rate depends on the area of the hole exposed to the fluid.

Ball valves, like plug valves and butterfly valves, are a type of right-angle rotary valve.They can be operated manually or with an actuator.The simplest operation of a ball valve is by the operator manually turning a wrench or lever.Torque is applied to rotate the lever arm 900 degrees clockwise or counterclockwise to open or close the valve. If the lever arm is parallel to the pipe, the valve is open. If the lever arm is perpendicular to the pipe, the valve is closed.

Ball valves are available in a variety of designs and features to meet a wide range of industrial needs.

The basic parts of a ball valve include the following:

Valve Shell

All internal components of a ball valve are contained within the valve shell or body.Its primary function is to provide a secure and airtight housing for the ball, ensuring that the flow of fluid through the valve can be precisely controlled.The shell usually has inlet and outlet ports that allow connection to piping or ducting.It is made of hard metal, thermoplastic or thermoplastic lined metal that protects the ball valve components. This rugged construction ensures reliable operation and longevity of the ball valve in a variety of industrial applications.

Ball

A ball is a sphere with a hole in its center. The hole in its center is called an orifice. When the fluid flow path and the cross-section of the hole are coplanar, the hole is used as a flow opening for the fluid. Otherwise, flow is restricted. A ball valve can have a solid ball or a hollow ball. A solid ball has a constant opening diameter throughout the structure, which helps the fluid to flow smoothly at a constant velocity. On the other hand, a hollow ball has a hollow internal structure with spaces inside that allow more fluid to pass through the valve. However, the larger space creates turbulence and high velocity. Hollow spheres are lighter and cheaper compared to solid spheres.

Shaft

The shaft connects the ball to the control mechanism that rotates the ball. As the shaft rotates, it either aligns the ball with the flow path of the valve to allow fluid flow or positions the ball perpendicular to the flow path to stop the fluid completely. The shaft has seals such as O-rings and packing rings to seal the shaft and bonnet from fluid leakage. The design and construction of the shaft must be robust and able to withstand the pressure and temperature conditions of the system to ensure reliable and efficient operation. The shaft can be operated manually by lever or handwheel, or by electric, pneumatic or hydraulic actuation.

Cap

The bonnet is an extension of the valve shell that contains and protects the shaft and its packing, which is important in high pressure and high temperature applications. It can be welded or bolted to the body. It is also made of hard metal and covers the opening that connects the shaft to the external control mechanism. Depending on the design of the valve, the bonnet can be removable or integrated into the body.

Seats

Ball valves have two seats, usually made of a soft material such as PTFE (Teflon) or elastomer. These seats form a tight seal around the ball when the valve is in the closed position. They prevent leakage by forming a safety barrier between the ball and the valve body. The upstream seat seals against pressure, while the downstream seat seals against leakage to the atmosphere.

Application:

Chemicals, air, water, steam, oil, acids, salts ect.

Features:

1. Two torsion springs are used excreting on each of the pair valve plates,which close the plates quickly And automatically.

2. The quick-close action prevents the medium from flowing back and eliminates water hammer effect.

3. Short body structure length and good rigidity.

4. This valve is tightly sealed, without leakage under the pressure water test.

5. Safe and reliable in operation,high interference-resistance.

Specifications:

Standards:

Material: