Product ID: 05147863 – Compression Spring (Sealing Head / Outlet Poppet Spring)

Description:
This component is a precision compression spring designed specifically for the sealing head assembly (check valve assembly) in high-pressure waterjet intensifier pumps . It functions as a return spring for the flat outlet poppet (discharge poppet), applying consistent force to close the valve after each pressure cycle . The part has a flared design which prevents the spring from becoming wedged inside the outlet poppet—a known issue with earlier straight spring designs .

Applications:

• Used as the outlet poppet return spring within the sealing head (high-pressure check valve assembly) of waterjet intensifier pumps .

• Installed in the sealing head body, positioned behind the outlet poppet (Product ID 05116561) to provide closing force during pump operation .

• Suitable for ultra-high pressure waterjet systems operating at 55,000–90,000 PSI (approximately 3,800–6,200 bar) .

• Compatible with .875 inch (7/8") plunger intensifier pumps, including KMT SL-IV series, Neoline units, and other standard intensifier assemblies .

Features:

• Flared Design: Engineered with a flared geometry that prevents the spring from becoming lodged inside the outlet poppet, ensuring reliable valve operation .

• High-Strength Material: Constructed from hardened stainless steel or high-tensile alloy steel, providing exceptional elasticity, fatigue resistance, and corrosion protection .

• Precision Manufacturing: CNC-formed and heat-treated for dimensional accuracy, consistent spring rate, and long service life under continuous high-cycle operation .

• Ultra-High Pressure Rating: Designed to withstand continuous operation at pressures up to 90,000 PSI without deformation or loss of tension .

• Lightweight: The component has a very light weight, approximately 0.002 lbs (0.9 grams) .

• Cross-Reference Compatibility: Replaces or cross-references with multiple part numbers including 20460033, 49894116, 1-11330, 5000127, 103674, and 6103674 .

Maintenance:

• Critical Wear Component: The spring is a consumable part that undergoes constant compression and decompression cycles. Fatigue or loss of tension will affect valve responsiveness and sealing performance .

• Inspection: During sealing head or check valve overhaul, inspect the spring for signs of fatigue, breakage, corrosion, or loss of tension. Compare its free length to manufacturer specifications.

• Replacement Criteria: Replace the spring if any deformation, cracking, or loss of spring force is detected. A weak spring may cause delayed valve closing, pressure fluctuations, or incomplete sealing .

• Set Replacement: When servicing the outlet check valve, it is recommended to replace the spring simultaneously with the outlet poppet (05116561), poppet pin (05116751), and seat (05112768) as a complete set .

• Design Note – Flared vs. Straight: If replacing an older straight spring (e.g., 49894116), upgrade to the flared design (05147863) to prevent the spring from becoming wedged inside the outlet poppet .

• Full Depressurization: Always fully depressurize the waterjet system and follow lockout/tagout procedures before removing the sealing head assembly or replacing the spring.

• Lubrication: Apply a light coating of manufacturer-recommended high-pressure grease to the spring ends during reassembly to prevent corrosion and ensure smooth operation.

• Kit Availability: This compression spring is included as a component in high-pressure check valve repair kits (e.g., KMT# 72169725 / WK000377) for .875 plunger intensifier pumps .