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Valve Repair
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| Pressure test valve repair Pre |
| Article source：江阴市欧雷斯阀门维修厂 Update Time：2012-11-3 |
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After valve repair pressure test it? There is this necessary? So how should the pressure test. Jiangyin Oulei Si valve repair plant: valve repair and the need for strict pressure test to ensure the quality of valve repair; Moreover, we also need to know the valve pressure test of principle, as well as valve pressure test to pay attention to some matters, The following simple set for you by the Jiangyin Oulei Si the valve repair pressure test Precautions:
Valve repair pressure test Note:
Valve repair, under normal circumstances, not only to do the valve strength test should also slightly higher standard strength tests on the body and bonnet after patch or corrosion damage to the valve body and bonnet. For the safety valve, set pressure and reseating pressure and other tests should be consistent with the provisions of the instructions and procedures. Strength and tightness test should be made before the valve is installed. Test, valve installation location should be easy to check direction. Welded connection in the form of valve can be used in the blind plate pressure test not the tapered seal or O-ring sealed pressure test. Hydraulic test valve air will be eliminated as much as possible. Gradually increased pressure to test, does not allow a sharp, sudden pressurization. The strength test and tightness-inspection duration is generally 2 ~ 3min, and special valves should last 5min. Small diameter valves corresponding short test time, large diameter valves corresponding long test time can be.
Valve repair pressure test Note:
The finished valve repair may be extended test time, during the trial, if in doubt. Strength test, does not allow the body and bonnet sweating or leakage. Tightness test, rotor pump the general valve only born to be a valve, safety valve, high pressure valve required twice. Test of the unimportant the valve of the low pressure, large caliber and provided to allow leakage valve, allowing a small amount of leakage; due universal valve, power station valve, marine valves, and other valves require different leakage perform according to relevant regulations. Throttle valve is not closed parts tightness test, but should be a strength test and packing and gaskets at tightness test. Pressure test, the valve closing force only allows a person''s normal physical strength to Close; shall not be by means of a lever like tools afterburner (except torque wrench), the handwheel diameter is greater than to wait until at 320mm, allowing two common off. Should remove the filler has on sealing valve for tightness test on the sealed official together, check for leaks. Test gas in the stuffing box filled with water check. For packing tightness test, are not allowed on the seal in a secret location. Where the valve drive device, test the tightness of application-driven device off valve pluck the tightness test. Manual drive device, it should also move to close the valve seal test. Strength tests and sealing tests mounted on the main valve bypass valve, the main valve strength and tightness test; shut down parts of the main valve is open, it should follow open.
Valve repair pressure test Note:
Cast iron valve repair finished strength test, the the application the copper hammer tapping valve body and valve cover, check whether there is any leakage. Valve when tested, except stopcock provided to allow the sealing topcoat oil, other valves does not allow the oiled test on the sealing surface. Valve pressure test, the pressing force of the blind plate valve should not be too large, so as not to distort the valve, affect the outcome of the trial (cast iron valves too tight, but also damaged). However, after the valve pressure test should promptly eliminate stagnant water and wipe clean valve, test records should also be well.
Above considerations of the pressure test conventional valve repair system is far better than complex the above valve repair pressure test of the multi Oulei Si valve repair plant in Jiangyin pressure test process.
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