DIAPHRAGMACTUATED VALVES

	DIAPHRAGM ACTUATED VALVES	RAF MODELS	RAF General Information
\| Description \| Applications \| Available Models \| Installation \| \| Typical Application \| Specification Form \| Animation \|	RAF 60/63 Pressure Reducing Hydraulic Valve

Description RAF 60 & RAF 63 are piloted hydraulic valves activated by line pressure. The pilot valve has a spring-loaded membrane which is sensitive to downstream pressure. The pilot’s spring is preset to a desirable reducing pressure. The pilot valve maintains a constant downstream pressure by gradually opening & closing of the RAF, at any flow rate.	Available Models RAF 60 - General Application 2-way Pressure reducing valve. Pressure rating up to 16 bars. RAF 63 - Agricultural & domestic Application 3-way pressure reducing valve. Size 2"-4". Pressure rating up to 10 bars.
Applications Use RAF 60 for general water supply systems with medium pressure rating. 2-way pilot configuration together with Raphael’s patented diaphragm, enables smooth & precise pressure control. The plastic Pilot model, RAF 63, is best for irrigation & low pressure applications. Use for domestic, water treatment circulation & filtration networks. The plastic materials & simple design provide high corrosion resistance & cost- effective prices.
Installation RAF Pressure Reducing Valve is activated by line pressure & controlled by a pilot valve. The pilot includes a spring- loaded membrane which is exposed to the downstream (controlled) pressure. The displacement of the membrane due to downstream fluctuations defines the flow direction inside the pilot. When the downstream pressure is lower than desired, the RAF valve is automatically directed to open. In the opposite case it is automatically directed to close. When line pressure is inserted into the control chamber of the RAF valve (above its diaphragm) the valve closes. When the control chamber drains the RAF valve opens due to the line pressure from below its diaphragm. In two-way configurations, the control chamber drains downstream, enabling faster & gradual opening without water spill. In three-way configurations, the control chamber drains out, enabling the valve to open fully.
RAF 60 - Two-way pilot		RAF 63 - Three-way pilot
RAF 60- control mode Manual: To open the RAF 60, close cocks 1 & 2 & open the Vent. To close the RAF 60 open cock 1 & close cock 2 & Vent (3). Automatic: When downstream pressure is lower than that of the pilot spring, the RAF 60 control chamber drains downstream, as illustrated. The RAF 60 valve is open. When the downstream pressure rises above the preset spring load, the pilot’s membrane is forced upward closing port 2 in the way. The RAF 60 then closes. Downstream pressure decreases.		RAF 63- control mode Manual: Use the three -way cock to close or open the RAF 63 by turning the handle to C or O positions, respectively. Automatic: Position the three-way cock handle to A. When the downstream pressure is lower than that of the pilot spring, the RAF 63 control chamber drains via ports 2 & 4 to open the RAF 63. When the downstream pressure is too high, the pilot membrane moves upward & opens ports 2 & 3. Line pressure closes the RAF 63.
Adjustment Use the needle valve a to control the RAF 60 operational speed. Adjust the reduced pressure set point by the adjusting screw. See the list of available springs on the next page.
Typical Application RAF 60 valves reduce the line pressure for irrigation plots & for residential water supplies.

Standard RAF 60	Standard RAF 63	Special Features RAF 60/63
Complete basic RAF valve as specified above	Complete basic RAF valve as specified above	Enamel/epoxy coating
Metal pilot (2-way)	Plastic pilot (3-way)	-
Self-cleaning screen filter	Self-cleaning screen filter	External heavy duty screen filter
60 mm pressure gauge	pressure checkpoint	-
Three cock valves	Selecting cock (3-way)	-
Needle valve		-
3/8" Reinforced Plastic tubes	8 mm Plastic tubes	Copper or stainless steel tubes