Cast steel fixed ball valve
Introduction to the cast steel fixed ball valve
Cast steel fixed ball valve is a new generation of high-performance ball valve, suitable for long distance pipeline and general industrial pipeline, its strength, security, and resistance to bad environment, special consideration when the design is suitable for all kinds of corrosive and non corrosive medium.Compared with the floating ball valve, it works, the fluid pressure in front of the sphere of all is passed to the bearing force, not making ball to seat, so the seat will not bear too much pressure, so the fixed ball valve torque is small, the seat changeForm small, stable sealing performance, long service life, applicable to high pressure, large diameter.Advanced spring seat components, since the tight characteristics, realize the upstream sealing.Each valve has two seats, each direction can be sealed, and therefore there is no flow restriction, installation is two-way.
Cast steel fixed ball valve characteristics
(1) easy operation: sphere by the upper and lower bearing support, reducing friction, eliminating the due to the inlet pressure to promote a sphere with the great seal seal seat load caused by too much torque.
(2) the sealing performance and reliable: ptfe sheet material sealing ring is embedded in the stainless steel seat, metal seat end equipped with spring guarantee seal enough pre-tightening force, valve sealing surface wear during operation, in the spring under the action of the valve to ensure good sealing performance.
(3) the fire protection structure: to prevent because of heat or fire, make ptfe sealing ring burned, larger leakage occurs, and feeds the fire, set up fire prevention sealing ring between the sphere and valve seat, burned down in sealing ring, in under the action of spring force, the seat ring is rapidly to the sphere, form the metal to metal seal, have a certain degree of sealing effect.Fire test apl6fa and apl607 standard requirements.
(4) automatic relief function: when the valve is the stagnation of midplane medium abnormal pressure rise more than spring pre-tightening force, the seat back out of the sphere to achieve the effect of pressure relief automatically, automatic reset after unloading seat.
(5) the discharge line: body are set up and down drain away, l can check whether the valve seat leakage, at work, when the valve is in full open or close, removing the midplane pressure, can directly replace the packing;Can discharge midplane retentate, reduce the pollution of the medium of the valve.Auxiliary seal set system (customer need please kindly tell)
(6) the valve design with auxiliary emergency seating system, once the seal is damaged or emergency ten green condition and cannot be sealed, sealing surface injection via the auxiliary seal system corresponding sealant can repair the sealing surface, to seal of emergency.When conveying medium impurity or contain a small amount of particles, to protect the sealing surface, ensuring reliable seal, but also injected a device with the corresponding detergent or lubricant was carried out on the sealing surface cleaning.
(7) is widely used in food, medicine, petroleum, chemical, natural gas, iron and steel, environmental protection, paper transfer line cut or flow of the medium.Can also be injected the device with the corresponding detergent or lubricant was carried out on the sealing surface cleaning.
