Gate valve product standard introduction
Core Tip: The standards of domestic manufacturers are not the same. For example, the lengths and production standards of American Standard Gate Valves produced by Shanghai Haogao Valve Co., Ltd., formerly Shanghai Minhang High and Medium Pressure Valve Factory and Shanghai Liangzhong Valve Factory.
The standards produced by major domestic manufacturers are not the same. For example, the lengths and production standards of American Standard Gate Valves produced by the Shanghai Min Gao Valve Co., Ltd. original Shanghai Minhang High and Medium Pressure Valve Factory and Shanghai Liangzhong Valve Factory are not the same. Forged steel gate valves often neglect pressure problems. During the grease injection operation, the pressure of the injection-regulating half-free float ball steam trap is changed by peaks and valleys. The pressure is too low, the seal leaks or the safety valve fails, the pressure is too high, the grease injection valve is blocked, the sealed grease is hardened, or the seal ring and the valve ball and the valve plate are locked. When the injection pressure is too low, the injected grease flows into the bottom of the valve chamber, which usually occurs in the small gate valve. The fat injection flow control valve pressure is too high, on the one hand to check the thermal insulation valve check grease injection mouth, if fat is blocked, the remote control float valve hole is closed and the spring is closed and the wrench is fully opened to replace; the other is a plunger stop valve on the one hand fat To harden, use a cleaning fluid, repeatedly soften the defective sealing grease, and inject new grease to replace it. In addition, the sealing type and the sealing material also affect the injection pressure. Different sealing types have different injection pressures. In general, the hard sealing pressure is higher than the soft sealing.
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