Parker RL4 Spring Kits – Adjustable Spring Packs for Relief Valves (10–400 psi)

Parker RL4 Spring Kits – Accurate Pressure Adjustment and Maintenance for RL4 Relief Valves

Parker’s RL4 Series spring kits are designed for quick and precise replacement of the spring in RL4 relief valves. These kits allow users to adjust or restore the valve’s cracking pressure in the field—ensuring safe and reliable operation.

Each kit includes:

• Color-coded spring
• PTFE washers
• Locking wire and seal
• Installation instructions

Spring kits are available in the following pressure ranges:

• 10–25 psi (magenta)
• 25–50 psi (brown)
• 50–100 psi (purple)
• 100–150 psi (dark green)
• 150–225 psi (dark blue)
• 225–400 psi (white)
• 10–225 psi (no color code)

Example part number:
KIT-RL4SP-100-150

Using genuine Parker spring kits ensures accurate pressure control, extended service life, and full compatibility with RL4 Series valves.