For each order, we check the dimension of the valve to ensure the standard data.
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For each order, we test the shell of the valve according to the pressure grade of the valve.
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For each order, we test the back Seat of the required valve according to the pressure grade.
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For each order, we test seal of the valve according to the valve pressure grade.
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For each order, we test the air Seal of the required valve according to the pressure grade.
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For each order, we test the air shell of the the required valve according to the pressure grade of the valve.
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