The pressure problem of forged steel stainless steel ball valves often occurs during the grease injection operation, and the grease injection pressure has a regular peak and valley change in a semi-free floating ball steam trap. The pressure is too low, the seal leaks or the safety valve fails, the pressure is too high, the grease injection port valve is blocked, the seal inner grease is hardened, or the sealing ring is locked with the valve ball or valve plate. Usually when the grease injection pressure is too low, the injected grease mostly flows into the bottom of the valve cavity, which usually occurs in small gate valves.
The pressure of the grease injection flow control valve is too high. On the one hand, check the stainless steel gate valve to check the grease injection nozzle. If the stainless steel gate valve hole is blocked, it is clear that the spring is closed and the spanner is fully opened. Replace it; on the other hand, the stainless steel gate valve is grease hardened, so use The cleaning fluid repeatedly softens the failed sealing grease and injects new grease to replace it. In addition, the seal type and sealing material also affect the grease injection pressure. Different sealing forms have different grease injection pressures. In general, the grease injection pressure for hard seals is higher than that for soft seals.
When the forged steel stainless steel gate valve is closed:
The sealing surface can be sealed only by the pressure of the medium, that is, relying on the pressure of the medium to press the sealing surface of the gate against the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface.
The gate valve of the gate valve moves linearly with the valve stem, which is called a lifting rod gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust.
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