Hydraulic Valve Actuator using System Pressure
Hydraulic Valve Actuator using System Pressure
(OP)
Can anyone point me to a general schematic of how this functions? I don’t necessarily need the actuators inner workings. I’m more interested in the connections to the system header. My specific situation is the application of a Pump control valve on a high service Pump. Thus I have (relatively) constant pressure on the distribution side and periods of no pressure on the Pump side. What I’m hoping is that the actuator will be connected to both sides, such that to shut the valve it will use distribution pressure and that to open the valve it will use discharge pressure, such that the valve won’t open if the pump isn’t generating an overcome pressure. Looking for a schematic that might illustrate this, or some other general working arrangement. Thanks in advance.





RE: Hydraulic Valve Actuator using System Pressure
RE: Hydraulic Valve Actuator using System Pressure
I was hoping I could tap the upstream side of the valve for valve open and the downstream side of the valve for valve shut...so that in the case of pump failure, the valve wouldn’t be able to open. Is this common or would this be an extraordinary arrangement?
RE: Hydraulic Valve Actuator using System Pressure
RE: Hydraulic Valve Actuator using System Pressure
RE: Hydraulic Valve Actuator using System Pressure
Note the spring in the valve which supplies additional closing force.
http://www.singervalve.com/pump-control-valves/106...
http://www.singervalve.com/pump-control-valves/106...
Refer to the schematic:
http://cdn2.hubspot.net/hub/230272/file-728572177-...
RE: Hydraulic Valve Actuator using System Pressure
There are valve vendors who will understand what you want, cla val are one but there are others who do this.
However it would be much easier to undertake if you did this via a small control system. If you've got a pump there surely you have an electrical supply also?
Come to think of it, what exactly is wrong with a simple non return valve? A spring plug valve would provide good shutoff capability and wouldn't open unless pressure on pump side exceeded header pressure.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Hydraulic Valve Actuator using System Pressure
RE: Hydraulic Valve Actuator using System Pressure
It's a ball valve, similar to attached sketch.
Client has requested that the actuator operate using system pressure.
There will be no check valve and no pressure switch talking to the control valve.
I have currently designed an interlock so that if the pump "fails to start" the valve will emergency shut. What I'm trying to protect against now is the remote case of motor starts but pump isn't pumping (sheared shaft, etc.). I want to make sure the valve doesn't open. So what I'm proposing is that instead of a standard 4-way solenoid (inlet, valve open, valve shut, drain) there may be two 3-way solenoids whereas pump discharge pressure is used to open the valve and system pressure is used to shut the valve. I've updated the sketch to reflect what I think the end result will need to be and reattached it here. I should have it figured out next week and will let you know I came up with.
RE: Hydraulic Valve Actuator using System Pressure
your diagram makes no sense to me, neither does the sentence about no check valve.
Also what does "high service" mean??
You can do this using sets of relays and spring loaded valves, but if you have no check valve then once the valve is open you have equal pressure either side of the valve as the water flows backwards at high velocity back through the pump if the pump isn't running.
what you've drawn won't work I can tell you that much.
Like I said before a high quality check valve or two in series will do exactly what you want with no actuator at all....
what sort of pressure are we talking here?
And is that header full of water and at high pressure?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Hydraulic Valve Actuator using System Pressure
RE: Hydraulic Valve Actuator using System Pressure
RE: Hydraulic Valve Actuator using System Pressure