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Participant

Join Date: Nov 2007
Posts: 1

mixed water valves

11/19/2007 6:30 PM

I am not so familiar yet with this sytem and the american engineering terminology. Therfore asking if someone can suggest some companies that could supply a 3-way water valve that conforms to the following

Valve characteristic description

Inlet flow = A

Outlet flow = B + C, thus A = B + C

Linear electric pilot control of valve able of adjusting from C = 0 to C = 240 gpm and the

Same for B, thus C = 240 then B = 0

The valve is never closed. The valve is intended for controlling a water stream threw two opposite nozzles thus creating a force F = (mv – movo)/t that is in balance when the flow B = C and maximum when either B = 0 or C = 0

The valve should be rather fast and able to move between end positions 1 to 2 in less1 – 3 seconds. There are no specific high quality or long life demands since the over all accumulated valve operation time during a 10 – 20 year life time will only be in the range of less than 100 hours and may be with an accumulated valve adjusting time less than 10 % of that..

Operationvolatage is 12 VDC and controlling should be directly proportional and linear but

with no specified accuracy. Low price may be of essence.

Thank You

Tomas Jarnmark

Cv

Cv

240 gpm

240 gpm

A

B

C

1

2

Point of balance with a flow of 120 gpm in both B and C

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Participant

Join Date: Aug 2007
Posts: 3
#1

Re: mixed water valves

11/20/2007 2:18 AM

Mixing Valves

Spirax Sarco - UK

ARI - Germany

Samson - Germany

Venn - Japan

TLV - Japan

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Anonymous Poster
#2
In reply to #1

Re: mixed water valves

11/20/2007 11:43 PM

Usually these valves are known as THREE WAY BYEPASS Valves and used in the chilled water circuit of a central air conditioning plant to control the desired room temperature.

Valves are available of various makes and sizes to suit to your requirement.

The valves are also available a manual mode , incase the motor fails.

Manufacturers : Honeywell

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Power-User

Join Date: Dec 2005
Posts: 125
#3

Re: mixed water valves

11/21/2007 12:11 PM

Most valve manufacrurers can provide a valve such as you describe. It is a 3-way valve. There are two types of 3-way valves: 1) Diverting valve with 1 inlet and 2 outlets; 2) Mixing valve with two inlets and 1 outlet. The difference is in the design of the valve seats and plugs. Usually the diverting valve seats are simiilar to gate valve seats and plugs. In that 1 outlet is always full open. The mixing valve plugs are generally characterized to produce a precentage of flow in relation to the percentage of valve opening. Since you would be multi-positioning the valve - modulating - a mixing valve configuration would be suitable in that the valve would have the capability of metering the flow, even though it would be used in the diverting configuration. I am not aware of an electric valve with an open-close rate of 3 seconds. A solenoid valve would have that kind of closing rate, but it would not be capable of being partially open or closed. If there is such a valve, I'm not aware of it. You might look at an "industrial grade" valve using a double acting pneumatic valve operator, one requiring an 80 psi air source. The valve operator must be sized to close against the total dynamic pressure of the fluid in the pipeline.

g scott

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