초록 ▼

To test the tightnesses of two valves arranged upstream respectively downstream of each other in a fluid line, the pressure conditions in the line portion between the two valves is measured with both valves being closed. Following a certain time after the closure of the two valves, the pressure in t

To test the tightnesses of two valves arranged upstream respectively downstream of each other in a fluid line, the pressure conditions in the line portion between the two valves is measured with both valves being closed. Following a certain time after the closure of the two valves, the pressure in the line portion is measured to determine whether pressure is above or below a predetermined limit pressure to conclude whether the one or the other valve is tight. Following this determination, the passageway is opened across the valve taken to be tight and the line portion is then drained or filled. During a measuring time interval then following, a differential pressure sensing device measures whether and how often the pressure in the line portion reaches or passes the limit pressure. The valve not yet taken to be tight is judged tight if the limit pressure is reached or passed once and considered not to be tight if the limit pressure is not reached or passed or reached or passed more than once during the measuring time.

대표청구항 ▼

A method of determining the tightnesses of a first and a second valve arranged in a fluid line and spaced relative to each other, said method comprising the steps of: building up a pressure gradient in said fluid line so that the fluid tends to flow in one direction, a first one of said two valves t

A method of determining the tightnesses of a first and a second valve arranged in a fluid line and spaced relative to each other, said method comprising the steps of: building up a pressure gradient in said fluid line so that the fluid tends to flow in one direction, a first one of said two valves thereby becoming an upstream valve and a second one of said two valves thereby becoming a downstream valve; closing said two valves; presetting a limit pressure in the range between the pressure upstream of said upstream valve and the pressure downstream of said downstream valve; determining the pressure in the line portion between said upstream valve and said downstream valve and comparing said line portion pressure with said limit pressure; taking said upstream valve to be substantially tight if after a holding time the pressure so determined is below said limit pressure and taking said downstream valve to be substantially tight if after said holding time the pressure so determined is above said limit pressure; opening a passageway across said valve so taken to be substantially tight to allow the pressure in said line portion to change and to enable testing of the other valve not so taken to be substantially tight; determining the pressure in said line portion and comparing the pressure so determined with said limit pressure; and judging said other valve to be substantially tight if, during a measuring time interval commencing upon the opening of said passageway, the pressure in said line portion does not reach said limit pressure less than one or more than once.