D-PREL SERIES - PRESSURE REDUCING SELENOID CONTROL VALVE

PRODUCT DESCRIPTION

Pressure reducing selenoid control valves (w/electric switch) are hydraulic control valves which perform opening & closing function in operation through remotely and automatically via electrical power. Desired outlet pressure value is easily adjusted by means of pressure reducing valve on pressure reducing selenoid control valves. A control device which are capable of emitting electrical signals, commands pressure reducing selenoid control valves via a PLC control unit or time limit relay.

PROPERTIES

1- Selenoid valves on the control valve could either be of a 3/2 way or 2/2 way type depending on the application.
2- Selenoid control valves could be selected optionally as either normally closed (N. C) or normally open (N.
3- Standard voltage value of Selenoid control valves is 24 Volt AC. But optionally it is possible to ensure control with several voltage values by means of 9 volt DC latching or 12 volt DC coils.
4- Outlet pressure of the valve could easily be adjusted to a desired value by means of pressure reducing pilot valve used on the valve.
5- Could be used in several applications through the installation of different type of additional pilot valves on the valve providing controls for pressure, flow rate, and level.

WORKING PRINCIPLE

VALVE OPENED
Once an electrical signal via a control unit is sent to a 3/2 way selenoid valve on a selenoid control valve, it turns off “P” port of the selenoid valve which then prevents the line pressure to enter the selenoid valve. Pressurized water in the valve actuator arrives at “V” port passing through “C” port and then main valve opens itself fully following the discharge of pressurized water in the valve actuator into atmosphere.

VALVE CLOSED
Once the electrical signal is turned off via control unit, selenoid core in the selenoid valve changes its position switching “P” port to open position and “V” port to closed position. Thus, the line pressure arrives at “C” port from “P” port of selenoid valve and filling up the valve actuator, it enables the main valve to be fully closed with a full-sealing.

SAMPLE MOUNTING AND APPLICATION SCHEME

1.Air Dischary Valve
2.Isolation Valve (Gate Valve , Butterfly Valve ,etc.)
3. Pressure Reducing Selenoid Control Valve
4.Control Panel

APPLICATION SCHEME

Install the valve according to the flow direction arrow on it.
For the sake of simplicity in case of service maintenance, it is recommended to mount isolation valves (gate, butterfly or ball etc. valves) to close the water in the inlet direction of the line.
For enabling the valve to operate efficiently, it is recommended a vacum lifter to be placed before the valve.
o avoid frosting in the winter, discharge the water in the valve actuator into atmosphere.
After installing the main valve in the line, set up the electrical connection of selenoid valve in the control unit to be used.
Diameter of the cable to be used for the transmission of electricity from the control unit to the selenoid control valve should be determined properly, according to the electrical property of the selenoid valve and the distance between the control unit to the selenoid control valve.
Voltage value of the control unit to be used should be the same as voltage value of the selenoid valve.
Adjust the outlet pressure value of the valve by means of adjustment bolt of pressure reducing pilot valve (shown as 6). Turning the pilot adjustment bolt clockwise will increase the outlet pressure value, whereas it will decrease in case it is turned counterclockwise.
Clean the filter (shown as 2) according to the contamination level of water.

1.Mini Ball Valve
2.Stranier
3.Pilot Adjustment Bolt
4.Check Valve
5.Pressure Reducing Valve
6.Manometer