The sample was attached to 48" water head height which is approximately 1.73 psi (89.76mmhg), it did not leak at the umbrella valve.The sample was attached to the roller pump and tested at low speed and high speed.No leak was seen.Then the sample was tested at different pressure settings of negative and positive pressures, the valve leaked at positive pressure of 1310mmhg.These valves are designed for pressure relief at a negative pressure of -200mmhg and at a positive pressure <1300mmhg.The roller pump was ran to test for retrograde flow, the valve leaked at the pressure relief band as it is designed to do so.Evaluation in progress, not yet complete.
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