Keckley Valve

will smith_4

Got a two pipe system. Has been retro-fitted with a condensate return assist pump, which fills a holding tank, which then sends condensate over to a condensate receiver tank, which then, on demand and through seperate pumps, feeds three seperate boilers as needed.
Each of the boilers has it's own feeder control, each feeder activates a pump relay.
The pumps are piped into the bottom of each boiler through a loop which comes from down low at the discharge of the boiler feed pumps, then up, higher than the the water level of each boiler, then down, into the bottom of the boilers.
In each of the feed circuits, there is this valve: a Keckley 48515-1-9 Type 119R, Regulating range 10-20#. Pic attached.
The highest operating pressure in the system is 3 lbs; we have some very long runs in the compound this system feeds.
My question is regarding these valves. My thought is that they were put in to reduce the pressure at which condensate could be sent back to the boilers to prevent either thermal shock or surging, but so far, I can't get any feedback from my control co.s My problem is that I've got one that is not feeding condensate back fast enough, and one of my boilers cuts out on low water; I've tried adjusting the head of the valve to no avail good or bad, the pump is pumping, and the line itself is clear. If I'm right in my thinking, could I get rid of it, and replace it with a square head cock and a check valve to accomplish the same thing it used to do?

Dan Law_4

Keckley Valve

I notice the valve has what appears to be a compresion fitting on the diaphram. Can you tell me what was connected to this fitting, more specificaly, what is the control signal source to this valve? Pneumatic, steam, pump pressure? The valve itself is just a spring opposed, diaphram actuated globe valve. It's function is related more to the control set up than the type of valve it is. The control range most likley refers to the spring range of the valve. Also helpful to know if the valve is normaly open or normally closed.

will smith_4

Thanks for the reply

Dan- The compression fitting was actually connected to the discharge line of the pump itself.