Purchase Specification
Model No. 750-01
Pressure Relief, 
Sustaining & Back Pressure Valve 

Sizes:	2, 3, and 4 inch wafer style
	6, 8, 10, and 12 inch flanged
	6, 8, 10, 12 inch Victaulic¨ Ends


Installation

The Cla-Val Model 750-01 is a hydraulically operated pilot actuated automatic control valve for pressure sustaining, relief and/or back pressure service. The main valve consists of only two parts, a stainless steel body and an elastomeric liner or control element. 

The Cla-Val Model 750-01 will open when inlet pressure begins to exceed a preset pressure and will allow enough flow to maintain that inlet pressure. In pressure sustaining service, Cla-Val Model 750-01 will conserve pressure in an upper system during periods of high demand in a system below. In pressure relief service, the Cla-Val Model 750-01 will modulate to exhaust line pressure to keep it below a set point maximum. On a pump bypass system, the valve will allow flow back to the pump suction when pump discharge pressure exceeds the set point. 

Cla-Val Model 750-01 will control from no flow to full open flow without any chattering or slamming under low flow conditions. For this reason, on by-pass, relief, and pressure sustaining service, there is never a region of control instability. There is no slip-type friction in Cla-Val Model 750-01 because the valve has no bearings. Cla-Val Model 750-01 valves have excellent resistance to cavitation with a Cf factor of 0.9. 

Cla-Val Model 750-01 valves can be supplied as combination control valve with check. Pilot controls, options, and accessories are fully piped at the factory and the Cla-Val Model 750-01 is shipped ready for installation. 


Description

Valve and control system shall maintain inlet pressure at a predetermined set point; shall open as pressure starts to increase above the set point, and close as pressure falls below the set point. Control valve shall be constructed of two parts: an 18-8 (304) stainless steel body and an elastomeric liner or control element. Minimum rangeability shall be 500:1 based on capacity at flowing pressure conditions. Cf shall be greater than or equal to 0.9. Valve and control system shall be similar in all respects to Cla-Val Model 750-01 as manufactured by Cla-Val Co., Newport Beach, California or approved equal. 


Material Specification

Body: 			18-8 (304L) stainless steel*	 	
Liner:			Natural Rubber, 65 durometer (std)	Viton, EPDM, Nitrile, Silicone (available) 

Liner Retainer		18-8 (304) stainless steel*

Pilot 		
Body: 			ASTM B62 Bronze*
Spring Cover: 		ASTM B62 Bronze*
Wetted Parts: 		Bronze/Stainless steel
			Buna¨ N*
Accessories 
Shut-off Cock: 		Brass*
Speed Controls: 		Brass*
Check Controls: 		Brass*
Control Piping: 		Copper*
Control Fittings: 		Brass*
*316 stainless steel available

Valve and control system shall be similar in all respects to Cla-Val Model 750-01 as manufactured by Cla-Val Co., Newport Beach, California or approved equal.