© 2018 by Analytical and Control Technology 2000 Co., Ltd.

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Parker Relief Valves are designed such that when upstream pressure exceeds the closing force exerted by the spring,the lower stem opens,permitting flow through the valve.

Relief Valves
> RL4 Series

• Handle for field maintenance

• Externally adjustable pressure settings

   while valve is in operation

• Color coded springs and labels indicate

   spring cracking range

 

• Manual override option with positive stem

   retraction is available for the full working

   pressure range

• Seven different springs

> RH4 Series

• Eight springs

• Manual override option with positive stem

   retraction is available for pressures up to

   1,500 psi (103 bar)

• Preset from factory and comes with

   standard springs

> HPRV – PED High Pressure Proportional Relief Valve

• Captured moulded seat design is blow-out

   and chip resistant

• Color coded springs and labels indicate

   spring cracking range

• Unique Tru-Loc facility prevents accidental

   adjustment

• Low friction stem seal design prevents

   friction which increases accuracy of

   cracking pressure and reseat pressure

• Balanced poppet design ensures

   consistent cracking pressure regardless of

   system back pressure

• Multiple end connections available

> HPRV – PED Low Pressure Proportional Relief Valve

• Pressure settings are externally adjustable.

   Six different spring ranges provide greater

   system sensitivity and enhanced

   performance

• Back pressure has minimum effect on

   cracking pressure

• Color coded springs and labels indicate

   spring cracking range

• Orifice sizes: 5.2mm (0.203")

• Lock wire feature secures a given pressure

   setting

• Multiple end connections available