Parker RH4 Spring Kits – Adjustable Spring Packs for Relief Valves (50–6000 psi)

Parker RH4 Spring Kits – Accurate Pressure Adjustment and Maintenance for Relief Valves

Parker’s RH4 Series spring kits are designed for fast and precise replacement of the spring in RH4 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 8 pressure ranges from 50 to 6000 psi:

• 50–350 psi (gray)
• 350–750 psi (red)
• 750–1500 psi (orange)
• 1500–2250 psi (yellow)
• 2250–3000 psi (light green)
• 3000–4000 psi (light blue)
• 4000–5000 psi (violet)
• 5000–6000 psi (lemon yellow)

Example part number:
KIT-RH4SP-1500-2250

Using genuine Parker spring kits ensures accurate pressure control, long service life, and full compatibility with RH4 Series valves.