Page 11 - Parker - Process control product selection guide

Relief Valves

RL4 Series (Catalog 4135-CV)
• Handle for field maintenance • Manual override option with positive
stem retraction is available for the
• Externally adjustable pressure full working pressure range
settings while valve is in operation
• Color coded springs and labels
• Seven different springs
indicate spring cracking range

RH4 Series (Catalog 4135-CV)
• Eight springs • Preset from factory and comes with
standard springs
• Manual override option with positive
stem retraction is available for
pressures up to 1,500 psi (103 bar)

HPRV – PED High Pressure Proportional Relief Valve
(Catalog 4190-HPRV)
• Captured moulded seat design is • Low friction stem seal design
blow-out and chip resistant prevents friction which increases
accuracy of cracking pressure and
• Color coded springs and labels reseat pressure
indicate spring cracking range
• Balanced poppet design ensures
• Unique Tru-Loc facility prevents consistent cracking pressure
accidental adjustment
regardless of system back pressure
• Multiple end connections available

HPRV – PED Low Pressure Proportional Relief Valve
(Catalog 4190-HPRV)
• Pressure settings are • Color coded springs and labels
externally adjustable. Six indicate spring cracking range
different spring ranges provide • Orifice sizes: 5.2mm (0.203")
greater system sensitivity and
enhanced performance • Lock wire feature secures a given
pressure setting
• Back pressure has minimum
effect on cracking pressure • Multiple end connections available

Body
Temperature Cv Material Seal Material End Connections

Maximum Stainless Steel Buna-N Rubber Propylene Rubber Highly Fluorinated Fluorocarbon Fluorocarbon Neoprene Rubber
Valve Operating Ethylene Rubber
Groups Model Series Pressure Min Max Max Min Max Catalog
400 psi -70 F 400 F 1/4 in 1/4 in
RL 0.8 x x x x x x 4135-CV
28 bar -57C 204 C 6mm 8mm
6,000 psi -70 F 400 F 1/4 in 1/4 in
RH 0.4 x x x x x x 4135-CV
Relief 414 bar -57C 204 C 6mm 8mm
Valves HPRV – 6,000 psi -45 F 250 F .41 x x x x x 1/4 in 1/4 in 4190-HPRV
High Pressure 414 bar -43C 121 C 6mm 6mm
HPRV – 400 psi -45 F 250 F 1/4 in 1/4 in
Low Pressure 27.6 bar -43C 121 C .41 x x x x x 6mm 6mm 4190-HPRV 11