2007-08-10 14:07:04 · 3 answers · asked by LD T 1 in Science & Mathematics ➔ Engineering
If it is a solenoid-actuated one it should be about a second. If it is motor-operated valve it should be about 20-30 seconds.
2007-08-10 16:19:00 · answer #1 · answered by Rich Z 7 · 0⤊ 0⤋
You may be wondering how much time should be taken when closing an indicating valve. If this is a butterfly valve in fire protection service, this is taken care of by requiring approved supply shutoff valves to take four turns of the handle to close. OS&Y and PIV valves require many turns. Fire hydrants should be turned off very very slowly.
The reason for all this is to privent water hammer, or surges.
2007-08-10 18:24:46 · answer #2 · answered by Ed 6 · 0⤊ 0⤋
It also depends on the type. Ball valve, butterfly valve, Cla/valv
block valve, etc. and what size 1" or 20". Also your instrument
air system pressure. Is it putting out the correct amount of air. Also how much pressure is in the line your diverting?
2007-08-11 00:37:30 · answer #3 · answered by c d 1 · 0⤊ 0⤋