Re: freeze resistant valve

Posted by Dale's Plumbing Service on November 11, 1999 at 23:17:53:
In response to Re: freeze resistant valve
: I am looking for a series of valves, in sizes 1/2 to 3 inch NPT, that can be frozen without damaging the valve. : They are for water systems on railroad maintenance equipment. : For years we have used ordinary ball valves. Water trapped in the annular space around the ball : freezes & cracks the housing. Currently we drill a vent hole through the casting, but it blows out : water on transition from on to off. : I've looked at butterfly/wafer type, but flanges take up too much space. Globes will work, but too much : pressure drop in open condition. Gates trap water in the stem area also. : Valves are on/off, need to be drain, or be of design not to trap any water, but don't have to operate : in the frozen condition. I just don't want them to break. : Thanks for any help. kevin 1-800-535-6726 x2261 Kevin, I think you need stop and waste ball valves. They need to have the drain petcock opened manually and i think they should have left and right side drains. Dale Peck LMP

Posted by Dale's Plumbing Service on November 11, 1999 at 23:17:53:

In response to Re: freeze resistant valve

: I am looking for a series of valves, in sizes 1/2 to 3 inch NPT, that can be frozen without damaging the valve.
: They are for water systems on railroad maintenance equipment.
: For years we have used ordinary ball valves. Water trapped in the annular space around the ball
: freezes & cracks the housing. Currently we drill a vent hole through the casting, but it blows out
: water on transition from on to off.

: I've looked at butterfly/wafer type, but flanges take up too much space. Globes will work, but too much
: pressure drop in open condition. Gates trap water in the stem area also.

: Valves are on/off, need to be drain, or be of design not to trap any water, but don't have to operate
: in the frozen condition. I just don't want them to break.

: Thanks for any help. kevin 1-800-535-6726 x2261

Kevin, I think you need stop and waste ball valves. They need to have the drain petcock opened manually and i think they should have left and right side drains. Dale Peck LMP

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