Products

HYDRAULIC VALVES

WATER WORKS

G SERIES - GLOB TYPE HYDRAULIC CONTROL VALVE G-PRV SERIES - PRESSURE REDUCING CONTROL VALVE G-QRV SERIES - PRESSURE RELIEF HYDRAULIC CONTROL VALVE G-FLV SERIES - FLOAT LEVEL CONTROL VALVE G-EL / 2W SERIES - SOLENOID CONTROL VALVE G-EL / 3W SERIES - SOLENOID CONTROL VALVE G-EFL SERIES - ELECTRICAL FLOAT CONTROL VALVE G-PSV SERIES - PRESSURE SUSTAINING CONTROL VALVE G-PRSV SERIES - PRESSURE REDUCING AND SUSTAINING CONTROL VALVE G-PREL SERIES - PRESSURE REDUCING SOLENOID CONTROL VALVE G-ECV SERIES - ELECTRONIC CONTROL VALVE G-DKV SERIES - FLOW CONTROL VALVES G-PKV SERIES - PUMP CONTROL VALVE G-REV SERIES - SURGE ANTICIPATING CONTROL VALVE G-CV SERIES - HYDRAULIC CHECKVALVE G-LCV SERIES - LIFT TYPE CHECKVALVE DQR / DIRECT ACTING RELIEF CONTROL VALVE DLG-EL / ELECTRIC ACTIVATION DELUGE ALARM VALVE DLG-P / PNEUMATIC ACTUATION DELUGE (DRY) ALARM VALVE DLG-ELP / ELECTRO-PNEUMATIC ACTIVATION DELUGE ALARM VALVE (PRE-ACTION)

IRRIGATION

FIRE FIGHTING

G SERIES - GLOB TYPE HYDRAULIC CONTROL VALVE G-PRV SERIES - PRESSURE REDUCING CONTROL VALVE G-QRV SERIES - PRESSURE RELIEF HYDRAULIC CONTROL VALVE G-FLV SERIES - FLOAT LEVEL CONTROL VALVE G-EL / 2W SERIES - SOLENOID CONTROL VALVE G-EL / 3W SERIES - SOLENOID CONTROL VALVE G-EFL SERIES - ELECTRICAL FLOAT CONTROL VALVE G-PSV SERIES - PRESSURE SUSTAINING CONTROL VALVE G-PRSV SERIES - PRESSURE REDUCING AND SUSTAINING CONTROL VALVE G-PREL SERIES - PRESSURE REDUCING SOLENOID CONTROL VALVE G-ECV SERIES - ELECTRONIC CONTROL VALVE G-DKV SERIES - FLOW CONTROL VALVES G-PKV SERIES - PUMP CONTROL VALVE G-REV SERIES - SURGE ANTICIPATING CONTROL VALVE G-CV SERIES - HYDRAULIC CHECKVALVE G-LCV SERIES - LIFT TYPE CHECKVALVE DQR / DIRECT ACTING RELIEF CONTROL VALVE DLG-EL / ELECTRIC ACTIVATION DELUGE ALARM VALVE DLG-P / PNEUMATIC ACTUATION DELUGE (DRY) ALARM VALVE DLG-ELP / ELECTRO-PNEUMATIC ACTIVATION DELUGE ALARM VALVE (PRE-ACTION)

MECHANICAL VALVES

KNIFE GATE VALVE SURFACE BOXES CHECK VALVE (CLASS 150) CHECK VALVE (DISC TYPE) CHECK VALVE (SPRING TYPE) CHECK VALVE (GLOBE TYPE) CHECK VALVE (BALL) CHECK VALVE (WAFER TYPE) CHECK VALVE (CLASS 125) CHECH VALVE (SWING TYPE) CHECK VALVE (VERTICAL TYPE) DISMANTLING JOINT FOOT VALVES SAFETY VALVES GLOBE VALVES GLOBE VALVE (CLASS 150) GLOBE VALVE (CLASS 125) BUTTERFLY VALVE (LUG TYPE) BUTTERFLY VALVES (DOUBLE FLANGE) BUTTERFLY VALVE (WAFER TYPE) STRAINER BASKET BALL VALVES (CLASS 150-300) BALL VALVE (PN10) BALL VALVE (PN16) BALL VALVE (THREADED) STRAINER (Y TYPE) IRRIGATION HYDRANT (DOUBLE OUTPUT) IRRIGATION HYDRANT (SINGLE OUTPUT) GATE VALVE RISING STEM (CLASS 150) GATE VALVE RISING STEM (CLASS 125) GATE VALVES (PN10) GATE VALVE RISING STEM (PN16) GATE VALVE RESILIENT SEATED (PN10) GATE VALVE RESILIENT SEATED (PN16) GATE VALVE (PN 16) GATE VALVE (WITH INDICATOR) GATE VALGE RISING STEM (PN10) FLOAT VALVE (ANGLE TYPE) FLOAT VALVE (FLAT TYPE) TILTING CHECK VALVE AIR VALVES FIRE HYDRANT (SHORT TYPE) FIRE HYDRANT (OVER GROUND)

D-QRV SERIES - PRESSURE RELIEF HYDRAULIC CONTROL VALVE

D-QRV SERIES - PRESSURE RELIEF HYDRAULIC CONTROL VALVE

PRODUCT DESCRIPTION

High-speed pressure relief hydraulic control valves are safety control valves which protect the piping systems against excessive pressure fluctuation due to opening & closing of pumps used in irrigation networks and distribution lines, by discharging that pressure fluctuation to atmosphere.

PROPERTIES

1- Protects piping system and other armatures through discharging excessive pressure which may occur within the valve network to atmosphere quickly.
2- Valve opens quickly, and then, after the discharge is completed, it is closed slowly and with a full-sealing, without causing any pressure fluctuation again in the line.
3- Operates hydraulically, completely with line pressure, without requiring an extra power supply.
4- Owing to its design with diaphragm actuator, its maintenance is considerably easy and cheap.
5- Operates safely, even in horizontal and vertical installations.

WORKING PRINCIPLE






VALVE OPEN
In case of a sudden pressure increase in the line, spring force in the 2 way relief pilot valve is overcome and discharge port of pilot valve opens. Pressurized water in the actuator of the main valve is discharged through the discharge port to atmosphere and thus, excessive pressure is discharged to atmosphere through opening of main valve body.






VALVE CLOSED
Once the pressure in the line reduces to its normal value, spring force in the pilot valve pushes the piston which is connected to diaphragm of pilot valve and closes the discharge port. Line pressure at the normal level enables the actuator of the main valve to be filled up with the pressurized water from the the inside of the pilot valve. Hence, pressurized water in the actuator pushes the diaphragm with the help of valve’s spring force and switches the valve to closed position with a full-sealing.

SAMPLE MOUNTING




1- Pump
2- Isolation Valve ( Gate Valve, Butteryfly Valve , etc.)
3-High -speed pressure Reilef Hydraulic Control Valve
4-Monometer
5-Air Discharge Valve ( Vacuum Lifter )
7-Check Valve

SAMPLE MOUNTING AND APPLICATION SCHEME

Install the valve according to the flow direction arrow on it.
Mount the high-speed pressure relief control valve in such a way that it is in a “TE” configuration with respect to the system and its valve outlet is open to atmosphere.
In order the high-speed pressure relief control valve to be operated in full efficiency, a valve diameter which is equal to the diamater of the pipeline should not be chosen. In general, the diameter of the high-speed pressure relief control valve should be chosen as 1/3 of the diameter of the pipeline. For example, in case of a main pipeline diameter with DN 150, the diameter to be chosen for the valve should be DN 50.
For the sake of simplicity in case of service maintenance, it is recommended to mount isolationvalves (gate,butterflyorballetc.valves)toclosethewaterintheinletdirectionof the line.
To avoid frosting in the winter, discharge the water in the valve actuator into atmosphere.
The adjustment of the high-speed pressure relief hydraulic control valve is made by means of adjusting bolt of pilot valve on the valve. If the pilot adjusting bolt is turned clockwise, pressure increases. When turned counterclockwise, then, pressure decreases.
If the valve does not close itself at the adjusted pressure value, untighten the needle valve on the pilot valve with a 1⁄2 or 1 turn






1. Mini Ball Valve
2. Strainer
3. Manometer
4. Pressure Reducing Pilot Valve
5. Pilot Adjusting Bolt