04. September 2015 · Comments Off · Categories: BALL VALVE

Eccentric hemisphere ball valve of air tightness test is divided into eccentric half ball to remove air tightness test and eccentric half ball line tightness test, are described below:

First, the eccentric hemisphere ball valve detached air tightness test
(1) The eccentric hemisphere ball valve in a semi-open state, both ends of the ball with pipe connection flange lid seal.
(2) To the end of the introduction of test medium, test medium for clean nitrogen or air, and the other end of the pipe joint block, gradually pressurized to 5.6bar close the inlet valve to stop the intake.
(3)The ball is rotated several times after the eccentric hemisphere ball valve off (operation of the drive means)
(4) Open the other end (non-introduction of test gas side) pipe fittings plug so that the chamber pressure is reduced to atmospheric pressure.
(5) At the test pressure (5.6bar), larger than 5min time, the intake chamber pressure shall not decline, the pressure gauge should be 0.4, range 10bar.
(6) At the same time eccentric hemisphere ball valve with soapy water to check each connecting flange portion and a filler portion of the external leak, without increasing the bubbles appear.
(7) The test medium is then introduced from the other side and repeat the test.
(8) After passing the test with compressed air blowing soap residue, demolition ends flange cover, remove the sealing surface of the eccentric half ball seal both ends of the residue, if any residue into the valve hole should be removed and cleaned.

Secondly, the eccentric half ball line tightness test
(1) Identify the subjects eccentric half ball valve, cut-off valve downstream is closed.
(2)To be tested in a semi-eccentric half ball open.
(3) To be tested before the introduction pipe eccentric half ball test medium, test medium for clean pressurized nitrogen to 5.6bar gradually close the inlet valve to stop the intake.
(4)The ball is rotated several times after the eccentric half ball valve is closed (operating the drive means).
(5) Open purge valve was tested eccentric half ball valve downstream of the outlet pipe so that the chamber pressure is atmospheric.
(6) At the test pressure (5.6bar), more than 15min time pressure must not fall into the gas chamber, the pressure gauge should be 0.4, range 10bar.
(7) While eccentric hemisphere ball valve with soapy water to check each connecting flange portion and a filler portion of the external leak, without increasing the bubbles appear.
(8) And to be tested eccentric half ball test medium, the test is repeated.
(9) After passing the test with compressed air blowing soap residue.
Tightness test method described above eccentric hemisphere ball valve can be applied to the vast majority of air tightness test.

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