Author:Site Editor Publish Time: 2019-07-11 Origin:Site
The professional maintenance work of the industrial gate valve before and after the installation plays a vital role in the service of the gate valve. The correct and orderly maintenance will protect the gate valve, make the gate valve function properly and extend the gate valve life.
List of content for this article：
1.Maintenance steps for gate valve,
2.Maintenance work when the gate valve is greased.
Gate valve maintenance work seems simple, but there are often neglected aspects of work.
Following is maintenance steps for gate valve:
1. The gate valve should be stored in a dry and ventilated room, and both ends of the passage must be blocked.
2. Gate valves stored for a long time should be inspected regularly to remove dirt and apply anti-rust oil on the processing surface.
3. After installation, it should be inspected regularly, mainly for inspection items:
(1) Wear of the sealing surface.
(2) Trapezoidal thread wear of the stem and stem nut.
(3) Whether the filler is out of date or not, and if it is damaged, it should be replaced in time.
(4) After assembly, the sealing performance test shall be carried out.
Maintenance work when the gate valve is greased
First, when the gate valve is greased, the problem of the amount of grease is often ignored. After the grease gun is refueled, the operator selects the gate 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, the excessive fat injection causes waste. There is no accurate calculation of the different gate valve sealing capacities based on the gate valve type category. The sealing capacity can be calculated in terms of gate valve size and type, and a proper amount of grease can be injected reasonably.
Second, when the gate valve is greased, the pressure problem is often ignored. 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 failure pressure is too high, the grease injection port is blocked, the seal grease is hardened or the seal ring is locked with the gate valve ball and the gate valve plate. Usually, when the grease pressure is too low, the injected grease flows into the bottom of the gate valve chamber, which usually occurs in a small gate valve. 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 fluid 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.