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Bermad - Model 21T - 2 Way - Electric Solenoid Valve - TRIO Type

Deeco - 21T - Product Image
Brand: Bermad
Category: Control Valves, 200 Series
Size Range:



Female Threaded BSP

Engineering Data:

Bermad - Model 205 - Basic Hydraulic Valve

Product Description

The BERMAD 2-Way Solenoid Controlled Valve with Trio integrated Open-Auto-Close manual selector, is a hydraulically operated, diaphragm-actuated control valve with internal hydraulic Feed & Bleed control loop. The Trio Integrated selector allows for open or close, manually overriding the electric signal. The BERMAD Model 21T opens and closes drip tight in response to an electric signal, which causes the solenoid to open or close the valve’s internal hydraulic loop.

Features & Benefits

  • Line Pressure Driven, Electrically Controlled On/Off
  • Smooth valve opening and closing
    • Accurate and stable regulation
    • Low operating pressure requirements
  • Plastic Globe Hydro-Efficient Valve
    • Unobstructed flow path
    • Single moving part
    • High flow capacity
    • Highly durable, chemical and cavitation resistant
  • Unitized Flexible Diaphragm and Guided Plug
    • Prevents diaphragm erosion and distortion
  • Fully Supported & Balanced Diaphragm
    • Requires low actuation pressure
  • User-Friendly Design
    • Simple in-line inspection and service

Bermad - 21T-3W - Typical Installation

Bermad - 21T-3W - Typical Installation

Typical Applications

  • Computerized Irrigation Systems
  • Drip Systems
  • Greenhouses Irrigation
  • Systems Subject to Varying Supply Pressure
  • Landscape
  • Energy Saving Irrigation Systems

Technical Data


Bermad - 21T-3W - Closed Operation

Closed Position

The internal restriction continuously allows line pressure into the control chamber. The solenoid controls outflow from the control chamber. When the solenoid is closed it causes pressure to accumulate in the control chamber, thereby forcing the valve to close.

Bermad - 21T-3W - Open Operation

Open Position

Opening the Solenoid releases more flow from the control chamber than the restriction can allow in. This causes the accumulated pressure in the control chamber to drop, enabling the line pressure acting on the plug to open the valve.


Body, Cover, and Plug

  • Reinforced Nylon


  • NR


  • NBR [Buna–N] and NR


  • Stainless Steel

Cover Bolts

  • Stainless Steel

Control Accessories

  • Plastic


  • DN12-50


  • Globe: DN12-50
  • Angle: DN40 & 50

End Connections

  • Female Threaded BSP

Pressure Rating

  • 10 bar.

Operating Pressure Range

  • 0.5-10 bar.

Valve Flow Coefficient

Bermad - 21T-3W - Valve  Flow Coefficient

Valve flow coefficient, Kv or Cv ∆P =( Q/ kv; Cv)²


Kv = Valve flow coefficient

Cv = Valve flow coefficient (flow in gpm at Diff. Press. 1 psi)

Q = Flow rate (m3 /h; gpm)

P = Differential pressure (bar; psi)

Cv = 1.155 Kv

Flow Chart

2-Way circuit "Added Head Loss" (for "V" below 2 m/s): 0.3 bar

Bermad - 21T-3W - Flow Chart

Bermad - 21T-3W - Flow Chart

Technical Specifications

Dimensions and Weights

Bermad - 21T-3W - Technical Specifications
Bermad - 21T-3W - Dimensions and Weights

Due to the wide range of options available and criteria for correct model selection, pricing and configuration are available on application only.

Please consult with Deeco engineers for more information.

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