WENZHOU PROM TRADING CO.,LTD.

3-PC flanged ball valve with handle

A ball valve is a valve whose locking or regulating element has a spherical shape.

This is one of the modern and progressive types of shut-off valves, the regulating element of which is a movable gate part having a spherical shape with an opening for the passage of the working medium flow and for its closure.

The design of ball valves is not new and has been known for more than 100 years, however, in early versions it did not provide a tight overlap of the passage of the medium due to the difficulty of providing it with metal surfaces of the ball plug and housing seats. The emergence and introduction of materials such as fluoroplast and synthetic rubbers for seat manufacturing into the reinforcement industry led to the widespread use of ball valves. The new materials made it possible to ensure the tightness of the closure and significantly reduce the effort required to operate the crane.

The movable element (gate) of such cranes is a spherical plug — a ball, along the axis of which a through circular hole is made for the passage of the medium. In pass-through cranes, it is enough to rotate the ball by 90° to completely close or open the passage. The diameter of the hole most often corresponds to the inner diameter of the pipeline on which the crane is installed, which in this case is called a full-bore. The hydraulic losses when the working medium passes through a fully open valve are very small, almost the same as when the medium passes through a pipe equal in length to the body of the crane, which is several times less than in other types of shut-off valves. This valuable quality has made ball valves the main shut-off device on the linear part of the main gas pipelines. However, narrowed valves are sometimes used to reduce the dimensions and torques required to control the valve.

In addition to the above, ball valves have a number of other advantages, including:

simplicity of construction;

high and reliable tightness;

small dimensions;

the simple shape of the flowing part and the absence of stagnant zones in it;

convenient operation;

short turnaround time;

suitable for viscous and polluted media, suspensions, pulps and slurries.

As a disadvantage, it can be noted the need for a "dead" zone for turning cranes with a cantilever handle. This disadvantage can be compensated by a crane with a wing handle.

The seats in the housing are made in the form of rings made of various types of plastics (mainly fluoroplast), which ensures reliable tightness, ease and smooth rotation of the ball plug, but limit the use of such valves for environments with a temperature of no more than 200 ° C.

The ball valves are operated manually (on small diameters) and using a mechanized drive — electric, pneumatic and hydraulic, and for valves on gas pipelines it is possible to use the working medium transported through the pipeline as the control medium of the pneumatic actuator. In everyday life, a ball valve can be called a semi-rotary valve.

These products can be used in systems of varying complexity.:

in pipelines for transportation of water – hot and cold;

in oil and gas transportation systems;

in the urban gas supply system;

as a control valve.

Drawing of 3-pc flanged ball valve with handle

Materials of Main Parts

Main Size & Weight

*The above dimensions are for reference only.