Many customers report that the valve always fails, but they don’t know how it
is, whether it is a quality problem or an operational problem. Today Wellhead
Equipment Manufacturers will tell you about it.
Wellhead Gate Valve
1. Whether there are defects such as blisters and cracks on the inner and outer surfaces of the valve.
2. Whether the valve seat and the valve body are firmly connected, whether the valve core and the valve seat are consistent, and whether the sealing surface is defective.
3. Whether the connection between the valve stem and the valve core is flexible and reliable, whether the valve stem is bent, and whether the thread is damaged or corroded.
4. Whether the packing and gasket are aging and damaged, whether the valve opening is flexible, etc.
5. There should be a nameplate on the valve body. The valve body and nameplate should include: manufacturer's name, valve name, nominal pressure, nominal diameter, etc.
6. The opening and closing position of the valve during transportation should meet the following requirements:
(A) Gate valves, stop valves, throttle valves, butterfly valves, bottom valves, regulating valves and other valves should be in the fully closed position.
(B) The stopcock and ball valve closing parts should be in the fully open position.
(C) The diaphragm valve should be in the closed position, and it must not be closed too tightly to prevent damage to the diaphragm valve.
(D) The disc of the check valve should be closed and fixed.
7. The spring type safety valve should have a lead seal, and the lever type safety valve should have a heavy hammer positioning device.
8. The action of the disc or spool of the check valve should be flexible and accurate, without eccentricity, displacement or skew.
9. The inner surface of the valve with rubber lining, enamel lining and plastic lining should be flat and smooth, and the lining layer and the base should be firmly bonded without cracks, bubbling and other defects.
10. The flange sealing surface should meet the requirements without radial scratches.
11. The valve must not be damaged, missing parts, corrosion, falling off the nameplate, etc., and the valve body must not be dirty.
12. Both ends of the valve should be protected by protective covers, and the handle or handwheel should be operated flexibly without jamming.
13. The valve quality certificate shall contain the following contents:
(a) Manufacturer's name and date of manufacture.
(B) Product name, model and specification.
(C) Nominal pressure, nominal diameter, applicable medium and applicable temperature.
(D) The standard, inspection conclusion and inspection date based on.
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