How to do the daily maintenance of the gate valves
The professional maintenance work of the valve before and after the production before the welding plays a vital role in the service of the valve. The correct and orderly maintenance will protect the valve, make the valve function properly and extend the valve. life. Valve maintenance work seems to be simple, but it is not.
The valve should be stored in a dry and ventilated room, and both ends of the passage must be blocked. Long-term storage of Hongfeng valves should be regularly checked to remove dirt and apply anti-rust oil on the processing surface.
After installation, it should be inspected regularly, the main inspection items: sealing surface wear. The trapezoidal thread wear of the stem and stem nut.
Whether the filler is out of date or not, if it is damaged, it should be replaced in time. After the Hongfeng valve is repaired and assembled, the sealing performance test shall be carried out.
When the valve is greased, the problem of the amount of grease is often overlooked. After the grease gun is refueled, the operator selects the valve and the grease injection method to perform the grease filling operation. There are two cases: on the one hand, the amount of grease is less than that of the grease, and the sealing surface is accelerated by the lack of lubricant.
On the other hand, excessive fat injection causes waste. There is no accurate calculation of the different valve sealing capacities based on the valve type category. The sealing capacity can be calculated in terms of valve size and type, and a proper amount of grease can be injected reasonably.we are check valve manufacturer and privide gate valve china,you can know it.
Pressure problems are often overlooked when valves are greased. During the grease injection operation, the grease injection pressure changes regularly in the peaks and valleys. The pressure is too low, the seal leakage or the failure pressure is too high, the grease injection port is blocked, the seal grease is hardened or the seal ring is locked with the valve ball and the valve plate. Usually, when the grease pressure is too low, the injected grease flows into the bottom of the valve cavity, which usually occurs in a small gate valve.we are check valve manufacturer and privide gate valve china,you can know it.
On the one hand, the grease injection pressure is too high. On the one hand, the grease injection nozzle is checked. If the grease hole is blocked, the situation is replaced. On the other hand, the grease is hardened. The cleaning solution is used to repeatedly soften the failed sealing grease and inject a new grease. .
In addition, the sealing type and sealing material also affect the grease filling pressure. Different sealing forms have different grease filling pressures. Generally, the hard sealing grease pressure is higher than the soft sealing.
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