The role of the valve is to isolate the equipment and piping systems, regulating the flow, to prevent back pressure, regulation and discharge pressure is the control element of the fluid pipeline system, the role is no different, so in the course of the usual need to pay attention to valve maintenance and care. Here to introduce the daily valve maintenance methods.
First, the daily maintenance of the valve
1, the valve storage environment should pay attention to, should be stored in a dry and ventilated room, and plug the ends of the pathway.
2, the valve should be checked regularly, and remove the dirt on it, smear anti-rust oil coated on its surface.
3, install the valve after the application should be regularly overhaul to ensure its normal work.
4, should check the valve sealing surface is worn, and under repair or replacement.
5, check the stem and stem nut trapezoidal thread wear, filler is out of date failure, etc., and make the necessary replacement.
6, the sealing performance of the valve should be tested to ensure its performance.
7, the valve in operation should be intact, the flange bolts and bolts on the bracket complete, non-destructive thread, no loose phenomenon.
8, If the handwheel is lost, it should be timely and can not be replaced by a live spanner.
9, packing gland does not allow skew or no preload gap.
10, if the valve environment is more harsh, vulnerable to rain, snow, dust, sand and other contaminants, you should install the protective cover for the stem.
11, the valve on the ruler should be kept intact, accurate, clear, the valve seal, cap.
12, insulation jacket should be no depression, cracks.
13, the valve in operation, to avoid its beat, or support heavy objects.
Second, when the valve fat care maintenance work
Pre-welding production and commissioning before the valve professional conservation work for the valve service in the production and operation plays a crucial role in the right and orderly effective maintenance will protect the valve so that the valve to function properly and extend the use of the valve life. Valve maintenance work seems simple, it is not. Often overlooked aspects of work.
First, the valve fat, often overlook the problem of fat volume.
After the grease gun, the operator chooses the valve and grease coupling method, the grease injection operation. There are two situations: on the one hand less fat less lipid injection, sealing surface due to the lack of lubricant to speed up wear and tear. On the other hand excessive fat, resulting in waste. There is no exact calculation of the different valve seal capacities based on the type of valve. The valve size and type can be calculated seal capacity, and then a reasonable amount of grease into the appropriate.
Second, the valve fat, often ignore the pressure problem.
In the grease injection operation, lipid injection pressure showed a regular change in the peak valley. Pressure is too low, the seal leak or failure pressure is too high, the injection port blocked, seal the lipid hardened or ring and valve ball, valve plate lock. Usually grease injection pressure is too low, more grease into the valve cavity flow at the bottom, usually occurs in the small gate valve. The grease injection pressure is too high, on the one hand check the grease nozzle, if the obstruction of the case identified to be replaced; on the other hand, lipid sclerosis, to use cleaning fluid, repeated softening failure of sealant, and injected new grease replacement . In addition, the sealing model and sealing material, but also affect the injection pressure, different sealing forms have different injection pressure, the general situation of hard sealing grease pressure is higher than the soft seal.
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