Octal Base Relay

What's the problem?

Let the, "NO 120vac signal wire" control a second contact that controls the valve.

The butteryfly valve actuator needs power to open and to close.

Get a self closing valve.

If using a wire off an NO (normally open) contact to open the valve,
then use a wire of the corresponding NC (normally closed) contact to close the valve.

With out full knowledge of all the devices it maybe little more complicated. Assuming you want automate something. As it is you are there and are able to shut it down if something fails. If automated you will not be. Some fail safes need to be incorporated in the change to protect the devices.

Are you manually opening the valve now. Or are you pushing a button to open and close it. What lets you know it's full open or closed? Is the motor holding the valve in position with electrical power or does the power cut out when open or closed? Reversing the motor will require two set of contactor.

If the pump tries to start up against a closed valve it may stall. So you may need a timer to give the valve time to open before the pump starts.

Thanks for everything so far. A self closing valve is not cost effective, this is a 8" valve.

Fail safes have been considered. Basically I need a pressure sensor. So if psi exceeds a set amount, it will shutdown the pump. A timer should not be needed. The well has to pump from 300' deep, and then over 1000' to get to the valves location. The valve will have plenty of time to open.

Where did the pressure sensor spring from?

Sort out the full spec of what you want then come and ask questions.

So the scheme you are working with is:

This pressure sensor is to directly interrupt the 120VAC.

Pressure is low, switch completes circuit, valve opens, state of relay changes (energize pump)

Pressure is high, switch opens circuit, valve closes, state of relay changes (de-energize pump)

The 120VAC circuit components are the pressure sensor, the valve, the relay, the wire, and the source. That's all.

Yeah, no.

Normally, water piping does not empty between cycles. Water is considered incompressible. So as soon at the pump starts, the pressure against a closed valve will become very high, even if that valve is 1300 feet away.

I don't quite follow your concept of reversing the polarity of a 120VAC supply to a solenoid valve for open/close control but do understand the workings of a dual coil solenoid valve.

Is this what you are trying to do?

_{Excuse my drafting skills, been using CAD for way too long}

The actuator is not a solenoid. Its a reversing motor.

Please post details.

The forum doesn't generally respond well to "20 Questions", plus having all the information up-front saves such a lot of time, which may be important; other postings come in and potential respondents to this one wander off to them.

A valid response so far would be "consult an experienced control circuit designer locally", for example, given the level of detail shared.

A single armature on the valve relay swinging between the upper contacts without the permanent connection on the left would turn the valve on and off. Normally limit switches (not shown) shut off valve motor power at the end of travel.

You say that you need to reverse polarity. That does not appear to make sense. Reversing polarity on a 120 vac valve motor will not cause it to reverse. The "whole idea" with AC is that it reverses polarity many times per second.

You may need to post a schematic of the valve operator.

Reversing polarity is the wrong term, sorry. I simply need to reverse the direction that the motor operates.

Some of these units have three wires (or three terminals) neutral, open, close. They are wired in the same way as the solenoid shown schematically above. However you have to be sure that the valve contains at least the logic to prevent the drive motor from continuing to run when the valve is (for example) fully open.

Doorman, you are correct.

Kfry, In an irrigation well, there are no check valves like a residential system would have. This is because these pumps run for days, sometimes months on end without shutting down. They pump anywhere from 600-2000 GPM. Today I timed how long it takes for the water to get to the surface when the pump is initially turned on. It took 30 seconds. The valve I have spec'd goes from fully closed to fully open in 27 seconds. There isnt much difference here, but even if the valve was only half open, there would not be any damage done to the system.

An 8" valve is more than what is needed for the 700 gpm I am pumping, but that is what size of manual valve is currently installed, and the new electric valve will be a direct bolt in.

Does the electric actuated valve have limit switches that open the circuit to the valve motor when it is fully open or fully closed?

The actuator has its own limit switches built in.

The actuator has 3 terminals.
#1 is power to close
#2 is nuetral
#3 is power to open

Can anyone provide a link to a normally closed pressure switch? I want it to open the circuit at 60 psi. I will install it on the nuetral side of the circuit

Edit: The valve is 100-240vac and will draw .3-.6 amps

Response #8 from KJK/USA is the diagram you are looking for.

He had already sussed out the probable operation of your valve.

Switches should not be installed in the neutral side of a circuit (with the exception of certain motor overload switches).

If I cant use the nuetral side, then I will need 3 seperate switches. That is not a problem if that is the way it needs to be.

The switch needs to have a manual reset. That way, if the pressure exceeds 60 psi, kicks the pump out, it doesnt drop back below 60psi and attempt to restart the pump while water is rushing back down

What is the rated current of the butterfly valve?

Does is have a forward-n-reverse wiring logic?

If so, please submit drawing of valve wiring.

Very simple if we have all the info provided.

The simple automatic garage door opener controller matches what you want to accomplish. Together with the corresponding safety and limit switches, (in your application will be the pressure limit switches). It can simultaneously control the pump together with the intended valve's opening and closing operations. You only need to take into consideration the total current carrying capacity of the relay contacts, making sure it matches load requirement!

This should work. Make sure everything is turned off and locked out before commencing work. Stay safe Elroy

We don't know if it is a single phase motor, a 3 phase motor, a servo motor, a stepper motor, has it's own controller and just needs signals, nothing. Without FULL information, this continues to be a "20 questions" game.

So let's start fresh, I say is it "animal mineral or vegetable"?

Next?