Forged steel valve can be classified into forged steel check valve, forged steel gate valve, forged steel ball valve, forged steel globe valve, self-sealing gate valve, self-sealing globe valve, self-sealing check valve, forged steel needle valve, forged steel heat preservation Valves, forged steel bellows valves, etc.
Forged steel gate valves often ignore pressure issues. During the grease injection operation, the grease injection pressure regularly changes with peaks and valleys. The pressure is too low, the seal leaks or the safety valve fails, the pressure is too high, the grease injection port is blocked by the valve manufacturer, the sealing inner grease is hardened, or the sealing ring is locked with the valve ball and 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. And the pressure of the grease injection flow control valve is too high. On the one hand, check the insulation gate valve and check the grease injection nozzle. If the grease remote control float valve hole is blocked, it will be determined that the spring is closed and the wrench is fully opened. On the other hand, the plunger stop valve is grease. To harden, use cleaning fluid to soften the failed sealant repeatedly and inject new grease to replace it. In addition, the sealing type and sealing material also affect the grease injection pressure. Different sealing forms have different grease injection pressures. Generally, the grease injection pressure of hard seals is higher than that of soft seals.
Forged steel globe valve pay attention to the problem that the valve is in the switch position. The ball valve is generally in the open position during maintenance, and in special cases, it is selected to be closed for maintenance. Other valves can not be regarded as open position. The forged steel globe valve must be closed during maintenance to ensure that the grease fills the sealing groove along the sealing ring. If it is opened, the sealing grease will fall directly into the flow channel or valve cavity, causing waste. When the valve is greased, the effect of grease injection is often ignored. During the grease injection operation, the pressure, grease injection volume, and switch position are all normal. However, in order to ensure the grease injection effect of the valve, it is sometimes necessary to open or close the valve, check the lubrication effect, and confirm that the surface of the valve ball or gate plate is evenly lubricated.
