Parker Toggle Valve

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  • Manufacturer: Parker Instrumentation
  • Product Family: V4AQ Series
  • Actuation: Lever Handle
  • Application: Purge/Rapid Fill System, Test Panel
  • Body Material: ASTM A182 F316 Stainless Steel
  • End Connection: Male Threaded x Male Threaded
  • Handle Material: Nylon 6/6
  • Nominal Size: 1/4 in. x 1/4 in.
  • Pressure Rating: 300 PSIG CWP
  • Temperature Rating: -20°F to 200 °F
Parker V4AQ Series Toggle Valve, 1/4" x 1/4", MPT x MPT, 300 PSIG CWP, F316 Stainless Steel, Ethylene Propylene Rubber Seal, Lever Handle, 0.49 Cv, Panel Mount, Manual, Quick Acting, Angle, Toggle Valve.

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Product Description

Relief Valve; Type Adjustable Pressure, Angle; Inlet Size 1/2 Inch; Outlet Size 1/2 Inch; End Connection CPI Single Ferrule Compression x CPI Single Ferrule Compression; Body Material ASTM A182 F316 Stainless Steel; Spring Material 17-7 Stainless Steel; Seal Material Fluorocarbon Rubber; Temperature Rating -10 to 400 Deg F; Pressure Rating 6000 PSIG CWP, 50 to 350 PSIG (Cracking); Inclusions/Features PTFE Back-Up Ring/Washer, 316 Stainless Steel Cap/Upper Stem/Bonnet/Lower Stem/Seat Retainer/Stem Guide/Handle Stem/Locknut, Fluorocarbon Rubber Stem Seal/Seat, Zinc Plated Steel Plug, Phenolic Handle; Application Process Control Line, Research Equipment, Monitoring Line; Hex Size 7/8 Inch and 1 Inch


Pressure Settings are Externally Adjustable While the Valve is in Operation; Multiple Spring Ranges Provide Greater System Sensitivity and Enhanced Performance; Captured Molded Seat Design is Blow-Out and Chip Resistant; Color Coded Springs and Labels Indicate Spring Cracking Range; Lock Wire Feature Secures a Given Pressure Setting; Back Pressure has Minimum Effect on Cracking Pressure

Series/Model Information

Parker R Series Relief Valves are unique since they offer both a low pressure valve line (RL4) and a higher pressure valve line (RH4). They are both designed such that when the upstream pressure exceeds the closing force exerted by the spring, the lower stem opens, permitting flow through the valve. Flow through the valve increases proportionately to the increase in upstream pressure. These relief valves work from 1-25 psig crack pressure systems up to 5,000-6,000 psig crack pressure systems. The highly visible color coded labels on the valves indicate the associated crack pressure spring included in the valve.


Stainless Steel Packing Nut/Lower Packing Washer/Handle Screw, PTFE Packing, Brass Upper Packing Washer