Armas Plastic Hydraulic Control Valves - 500 Series


Armas 500 series valves are direct diaphragm closing automatic hydraulic control valves which work with line pressure. They ensure easy and smooth flow with minimum pressure losses thanks to excellent design of valve body and diaphragm. No wearable parts such as stem, bearing and seat exist in main valve body, valve life is much longer than other competitor valves. Only movable part of valve is the valve diaphragm. Armas 500 series hydraulic control valves are designed so that it can be used in potable water force network, agricultural irrigation, filtration, industrial applications by even an unskilled personnel.


  • Easy use and maintenance due to simple design
  • Low cost
  • Operation in wide pressure range
  • Perfect modulation even in lower flow rates
  • Anti-surge closing and opening with flexible diaphragm
  • Full tightness thanks to reinforced diaphragm and inner spring
  • Long life with Glass Reinforced Polyamide material
  • Wide control application range by using different pilot valves
  • Operation in both horizontal and vertical positions in application areas


It is an automatic hydraulic control valve designed to make desired modulation in main valve network line as full hydraulically by means of line pressure without requiring different energy sources such as electric, pneumatic or mechanic energy.

Armas 500 series valve opening mode


When pilot valve located on main valve being in closed position is brought into relief position, pressurized water within control chamber on main valve diaphragm is released. When line pressure (P1) reaches to a value which will overcome spring force, water carries valve to fully open position by applying a hydraulic force to valve diaphragm from bottom.

Armas 500 series modulation mode


Pilot valves which are connected to main valve actuator ensure that main valve works in modulated mode. According to flow rate or pressure conditions, it ensures that main valve Works in modulation mode by controlling pressure of fluid within main valve actuator (control chamber).

Armas 500 series valve closing mode


When the pilot valves on the main valve transfers the upstream water pressure to valve actuator (control chamber), water in the control chamber creates a hydraulic force on the valve diaphragm. This pressure force combined with extra force applied by inner spring, ensures that valve will be closed with full tightness.