Bermad - Adjustable Direct Acting Pressure Reducing Valve - 20mm

The BERMAD Adjustable Direct Acting Pressure Reducer is actuated by a pressure-responsive diaphragm, which seeks to reach an equilibrium between hydraulic and set spring force. It reduces higher upstream pressure to lower constant downstream pressure regardless of fluctuating demand or varying upstream pressure. The low-flow version model IR-3/4” PRV-05 provides a superior solution under conditions of near zero demand.

Features & Benefits

• Advanced Construction Materials
  • High mechanical strength
  • Proven pressure, flow, and weather resistance
• Adjustable Direct Acting Pressure Reducer
  • Constant downstream pressure
  • Immediate response
  • Settable according to season and stage
• Plastic Body and Trim
  • Highly durable, chemical and cavitation resistant
  • Minimizes friction
• Unitized Rolling Diaphragm and Guided Plug
  • Accurate and stable regulation
  • Prevents diaphragm distortion
• User-Friendly Design
  • Can be installed at any orientation
  • Simple in-line inspection and service

Typical Applications

• Distribution Line Lateral Risers
• Non-Compensating Drip-Line Flow Fixation
• Lateral Final Burst Protection
• Pressure Reduction for Marginal Plots
• Irrigation Machine Sprinkler Flow Control (3/4"-PRV)
• Single Sprinkler Flow Fixation (3/4"-PRV)

Operation

The Upstream Pressure P1 applies balanced opening and closing hydraulic forces under Diaphragm 1 and above the Plug 2. The Downstream Pressure P2 applies hydraulic closing force under the plug, which seeks to reach equilibrium with the Set Spring 3 force. Should P2 rise above the setting, the hydraulic closing forces rise above the mechanical force of the spring, pushing the plug to modulate closed, and reducing P2 back to setting.

Materials

Body, Cover, and Actuator Assembly:

• Glass fiber reinforced
• Polyamide 6

Diaphragm:

• NBR (Buna-N),
• Nylon fabric reinforced

Spring:

• Stainless Steel

Size

• ¾”; DN20

End Connections

• Threaded
• Inlet: Female BSP; NPT
• Outlet: Female BSP; NPT or Male BSPT; NPT

Flow Range

• 0.2-5 m3/h; 0.9-22 gpm (3/4"-PRV)
• 0.01-3 m3/h; 0.04-13 gpm (3/4”-PRV-05)

Pressure Ratings

• 10 bar

Operating Pressure Range

• 0.7-9 bar

Temperature

• Water up to 60°C

Setting Springs Selection Table

Flow Coefficient

Kv 3/4”-PRV: 4.6

Kv 3/4”-PRV-05 (Low Flow): 4.2

Flow Chart

P1 Minimum = P2 Setting + ΔP in Flow Chart

Valves Dimensions & Weights