Fixed ball valve adopts fixed valve spool valve stem up and down (axis) and movable seal seat design. Work is more stable. Automatic compensation function, two-way sealing seat no clearance between rotation has great shearing force and self-cleaning function. Especially suitable for imperial fiber and has a small solid particles suspension and viscous hydraulic fitting supplier medium on and off. Fixed ball valve products can be widely used in papermaking, petrochemical, chemical, metallurgy, electric power, environmental protection, petroleum, light industry and other industrial departments of automation control system. The structure of fixed ball valve features:
1, blocking and discharge:
Fixed ball valve USES the floating seat spring preload, regardless of when the valve is in full open or close state, upstream and downstream side of the seat that fluid blocking, body lumen retentate through the discharge valve discharge.
Valve is closed, the upstream and downstream side of the seat that fluid blocking. Fixed ball valve body lumen stagnant toughening can discharge, the discharge device has the following features:
(1) in advance can check seat leakage damage;
7) reduce the amount of pollution released into the medium replacement of fixed ball valve;
(3) under the working pressure, the ball valve manufacturer valve is in full open or close state, can replac the valve stem packing.
2, automatic pressure release:
Stop valve body cavity medium temperature increase caused by the abnormal pressure, do not need through the relief valve, and only on the seat function can automatic relief, this to guarantee the safety of valve in liquid medium is very important.
Ball valve lumen stagnant medium due to temperature increase, and the abnormal pressure, the valve seat from the sphere of automatic pressure relief (figure 9) or valve installed on the valve (figure 10) to ensure the safety system.
3, completely sealed:
Fixed ball valve has a unique way of seal, fluid completely blocked.
4, fire prevention structure:
One thousand fire or due to 14 needle valve abnormal heat up to soften teflon field a loss. To prevent fire, fixed ball valve is still reliable operation, and at the same time can block and ball contact (figure 11: instantaneous sealing role. Comply with the provisions of the APl, 607.
5, sealing on the rescue of emergency
Seat tightness due to medium foreign body 38 needle valve or fire accident failure, greasing valve provides a connection to a quick note grease gun, convenient and quick to sealing grease injection to the valve seat sealing parts, reduce leakage. 6, reliable stem seal and low operating torque
In addition to setting the standard of sealing ring, the packing gland is also equipped with the "O" type sealing ring, double seal to ensure the stem seal can rely on; Adding graphite packing and sealing grease injection to make the valve stem leakage after the fire fell to a low zui. Sliding bearing and thrust bearing makes the valve stem operation.
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