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Pressure Reducing and Pressure Sustaining Control Valves

Hydraulic Control Valves

The Pressure Reducing and Sustaining Control Valve is the control valve that reduces the output pressure to the desired value by holding the input pressure. There are two pilots on the valve. The pilot in the inlet direction is the pressure stabilization pilot and fixes the inlet pressure. The other pilot ensures that the pressure reducer remains constant by reducing the pilot pressure and the output pressure to the desired value. The pressure reducing and stabilizing control valve allows the system to operate at normal values by reducing excessive flow in the downward slope direction and lowering the high pressure. The valve keeps constantly controlling the inlet pressure and outlet pressure without being influenced by the flow rate changes.

Existing Diameters According To Their Connections

  • Flanged: DN50, … , DN300
  • Angeled: 2″, DN50, DN80, DN100, DN150
  • Threaded: 3/4″, 1″, 1¼”, 1½”, 2″, 2½”, 3″
  • Victaulic : 2″, 3″, 4″, 6″
Operating Pressure
Standart 0,7 – 16 bar (10 – 240 psi)
Low Pressure Range 0,5 – 10 bar (7,5 – 160 psi)
High Pressure Range 0,7 – 25 bar (10 – 360 psi)
Temperature
Min. Operating Temperature -10 °C (14 °F) DIN 2401/2
Max. Operating Temperature 80 °C (176 °F) DIN 2401/2
Port
Flanged DIN 2501, ISO 7005 – 2
Threaded ISO (BSP) , ANSI (NPT)
Coating
Standard Epoxy
Optional Polyester
Hydraulic Links
Standard Reinforced Nylon (Air Brake))
Hydraulic pipe SAE J 844
Optional Copper DIN 1057
Actuator Type
Single-Control Housing | Aperture Actuator, Aperture Off

Automatic control valves are used to perform the required operations as hydraulic with line pressure without the need for energy sources in the network line.

Valve Closing Mode

When the water pressure reaches the diaphragm, the water creates hydraulic force. This hydraulic force diaphragm, combined with the force applied by the spring creates a complete seal and allows it to close.


Valve Opening Mode

When the pilot on the main control valve in the closed position is placed in the evacuation position, pressurized water on the diaphragm of the main control valve is discharged. When the line pressure reaches the position to overcome the spring force, it applies hydraulic force from the bottom to the diaphragm of the control valve and allows the valve to reach the full open position


Modulation Mode

They are pilots connected to the control valve which enables the main valve to operate in this position. According to the amount of flow and pressure required to be adjusted, it controls the water pressure on the diaphragm continuously and allows it to operate in modulated position.

  • Easy operation and maintenance with simple structure
  • Low cost
  • Working at wide pressure value range
  • Perfect modulation even at low flow rates
  • Continuous on / off with flexible aperture
  • Full seal with reinforced diaphragm and inner spring
  • Long life with epoxy-polyester coating
  • Wide range of control area with the use of different pilot valves
  • Ability to work in horizontal and vertical positions in application areas
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
inch
mm
Valve Diameter
2 50 65 3 80 4 100 5 125 6 150 8 200 10 250 12 300
CV m³/h @ 1 bar
88 88 174 187 187 419 1139 1698 2276
Kv gpm @ 1 bar
102 102 201 216 216 484 1316 1961 2629

KV: Valve flow Coefficient (Flow Rate At 1 Bar Pressure Loss M³/h @ 1 BAR)

CV: Valve flow Coefficient (Flow in pressure lossof 1 Psi GPM @ 1 Psi)

Q: Flow (M³/h, GPM)

ΔP: Pressure Loss (BAR, PSİ)

G: Specific Gravity of Water (For water = 1.0)

Installation
  • The connection to the “II” output of the pressure reducing pilot is provided with the help of copper or plastic pipe after connecting to the valve Inlet, finger filter number 3 and mini ball valve number 2.
  • The “I” output of the metal pilot is entered to the valve cover with the necessary connection elements.
  • Valve output is connected to mini ball valve No. 2/1. Connection to the “IV” output of the metal pilot is provided from here. Finally, manometer is connected to the “III” output of the metal pilot.
  • Valve rated diameter should be the same or a small rated diameter as the line diameter.
  • In the direction of the arrow indicated on the valve Mount.
  • Isolation valves (butterfly or sliding valve etc.) in the line Assembly of the valve.B) it is recommended to use air discharge valve, quick pressure discharge control valve (QR) and dirt retaining valves.
  • Cavitation risk during pressure drop is dangerous for valve body. Adjust the output pressure value you want to adjust by looking at the cavitation chart or contact our company.
Adjusting
  • Turn on the pump or turn on the mains main valve and give water to the system.
  • Turn on the ball valve indicated by “2” and turn off the ball valve indicated by “2/1”.
  • Wait for a while for water to reach the valve control chamber. When water reaches the control chamber, the manometer needle will show a certain pressure value.
  • Set the desired output pressure value by looking at the manometer with the adjustment Bolt indicated by “5” on pilot valve indicated by “1”.
  • When you turn the adjustment screw clockwise, the output pressure value will increase in the opposite direction  when you turn the output pressure value will decrease.
  • After adjusting the desired output pressure value, tighten the Contra nut under the adjustment Bolt. Turn on the ball valve indicated by “2” and give water to the system. After opening valve “2/1”, the manometer will display a value of zero.
  • Check the output pressure value continuously. If Valve does not perform regulation, contact our company.
  1. Pressure Lowering Pilot
  2. Mini Ball Valve
  3. Finger Filter
  4. Manometer
  5. Pressure Adjustment Bolt
  6. Needle Valve
Installation
  • After connecting the 3 number finger filter to the valve Inlet, the connection to the “II” outlet of the pressure reducing pilot and the “C” outlet of the 3-way valve is provided.
  • The “I” output of the plastic pilot is connected to the auto “A” output of the 3-way valve with the necessary connection elements.
  • The connection element is connected to Valve outlet • One output of the Te connection element is connected to the pilot’s “III” output and the other is connected to the manometer.
  • Valve rated diameter should be the same or a small rated diameter as the line diameter.
  • In the direction of the arrow indicated on the valve Mount.
  • Isolation valves (butterfly or sliding valve etc.) in the line Assembly of the valve.B) it is recommended to use air discharge valve, quick pressure discharge control valve (QR) and dirt retaining valves.
  • Cavitation risk during pressure drop is dangerous for valve body. Adjust the output pressure value you want to adjust by looking at the cavitation chart or contact our company.
Adjusting
  • Turn on the pump or turn on the mains main valve and give water to the system.
  • Keep the spherical valve indicated by “2” in auto position.
  • Adjust the adjustment bolt of the pressure reducing pilot valve indicated by “1” by looking at “4” to “5” manometers according to the desired output pressure value. When you turn the adjustment Bolt Clockwise, the output pressure value increases, otherwise it decreases in the direction.
  • After setting the adjustment point, tighten the control nut under the adjustment Bolt.
  1. Pressure Lowering Pilot
  2. Three-Way Valve
  3. Finger Filter
  4. Manometer
  5. Pressure Adjustment Bolt

FLANGED

Available Diameters
mm 50 65 80 100 125 150 200 250
inch 2 3 4 5 6 8 10
Port
Flanged
Material
GG25 – GGG40
Body
Globe
Transmission Pressure
PN10 – PN16 – PN25

VICTAULIC

Available Diameters
mm 50 65 80 100 150
inch 2 3 4 6

 

Port
Victaulic
Material
GG25 – GGG40
Body
Globe
Transmission Pressure
PN10 – PN16 – PN25

THREADED

Available Diameters
mm 25 40 50 65 80×50 80
inch 1 2 3x2x3
Port
Threaded
Material
GG25 – GGG40
Body
Globe
Transmission Pressure
PN10 – PN16 – PN25

ANGELED

Available Diameters
mm 50 80 100 150
inch 2 3 4 6
Port
Flange – Threaded
Material
GG25 – GGG40
Body
Globe
Transmission Pressure
PN10 – PN16 – PN25