DIAPHRAGM
ACTUATED VALVES

RAF MODELS

RAF
General Information

| Description | Applications | Available Models | Installation | Typical Application | Specification Form |

RAF 80Q
Quick Pressure
Relief Valve
Description
RAF 80Q is a piloted hydraulic valve activated by line pressure. The two-way pilot valve has a spring-loaded membrane which is sensitive to upstream pressure. The RAF 80Q is normally closed. As line pressure rises above the preset level, the valve opens quickly to relieve the excessive pressure. 		Available Models
RAF 80Q - General Application two-way Pressure Relief valve. Pressure rating up to 16 bars. The RAF 80Q is supplied in two standard configurations, both with metal pilots: small sizes (up to 4”) & medium size (6”-12”).
Applications
Use RAF 80Q for general water supply systems with medium pressure rating. The elaborated two-way pilot with Raphael’s patented diaphragm enables smooth & precise pressure control. Quick pressure relief valve protects water systems from quickly rising excessive pressure, due to water hammer surge. It is recommended to install RAF 80Q at the system head, right next to the main supply line or booster pump.
Installation
RAF 80Q Quick Pressure Relief Valve is activated by line pressure & controlled by a pilot valve. The pilot includes a spring-loaded membrane which is exposed to line pressure. The displacement of the membrane due to a rise of line pressure against the spring force changes the water flow inside the pilot.
The RAF 80Q is normally closed. Only when the line pressure is higher than the preset value, the RAF 80Q is piloted to open.


RAF 80Q - Quick Pressure Relief Valve


RAF 80Q- control mode
Automatic: When line pressure is low, the pilot is closed as illustrated. The RAF 80Q remains closed by line pressure. When line pressure is higher than the set point of the pilot, the spring is biased, enabling the membrane to move upward under the line pressure. The inner port of the pilot opens, the RAF control chamber drains through the vent. Then the RAF 80Q opens in a few seconds & relieves the excessive pressure.

 Typical Application


RAF 80Q valve relieves excessive line pressure to protect the irrigation system.
Adjustment
Use the needle valve a to control the RAF 68 operational speed.
Adjust pressure set points by the adjusting screws of the pilots. See the list of available springs on the next page.
 
Specification Form

Quick Pressure Relief Valve

Configuration

Model

Please Specify:

  • Line normal pressure
  • Relief set points.

Two way Pilots

 RAF 80Q
 
Standard RAF 80Q Size 2"-4" Standard RAF 80Q Size 6"-12" Special Features
Complete basic RAF valve as specified above

Complete basic RAF valve as specified above

 Enamel/epoxy coating
Self-cleaning screen filter

Self-cleaning screen filter

 External heavy duty screen filter
Metal pilot Metal pilot upon request -
3/8" Reinforced Plastic tubes 8 mm Plastic tubes Copper or stainless steel tubes
 
Metal Pilot
Body & bonnet- Brass
Spring-Music wire.
Membrane-Nylon fabric reinforced Natural Rubber.
Bolts & nuts-Zinc plated steel.
Pressure rating: up to 12 bar
 

DIAPHRAGM
ACTUATED VALVES

RAF MODELS

RAF
General Information

| Description | Applications | Available Models | Installation | Typical Application | Specification Form |

RAF 80Q
Quick Pressure
Relief Valve
 
RAPHAEL Valves Industries (1975) LTD. N. Ind. Zone, P.O.Box 555, Or-Aqiva 30600,Israel.
Tel. 972-4-6263555, Fax. 972-4-6263558 e-mail