Product ID: 49894116 – Check Valve Spring (Outlet Poppet Spring – Straight Design – Discontinued / Superseded)

Description:
This component is a check valve spring, specifically a straight compression spring designed for the outlet poppet in the sealing head assembly of KMT Streamline SL-IV waterjet intensifier pumps . This spring was a straight helical coil spring positioned between the outlet poppet (discharge poppet) and the poppet retainer, providing the closing force needed to seat the poppet against the high-pressure seat after each pressure cycle . This component is rated for ultra-high pressure operation up to 60,000 PSI (approximately 4,137 bar) .

IMPORTANT DISCONTINUATION AND REPLACEMENT NOTICE:
This product (49894116) is a straight spring design that has been discontinued by the manufacturer . The straight spring design was known to have a mechanical issue where the spring could become wedged inside the outlet poppet of the sealing head during operation . The manufacturer has replaced this part with a flared spring design (KMT part number 05147863), which prevents this wedging issue . When servicing the sealing head assembly, always use the replacement part 05147863 (flared spring) rather than the original straight spring 49894116 .

Applications:

• Used as the outlet poppet return spring within the sealing head (check valve assembly) of KMT Streamline SL-IV waterjet intensifier pumps 

• Installed in the sealing head assembly, positioned between the outlet poppet (05116561) and the poppet retainer (05116751), providing seating force for the poppet against the HP seat 

• Suitable for ultra-high pressure waterjet systems operating at 60,000 PSI (approximately 4,137 bar)

• Compatible with Streamline SL-IV series intensifier pumps and other .875 inch (7/8") plunger systems 

Features:

• Steel Construction: Manufactured from spring steel wire material, providing elasticity and fatigue resistance for high-cycle operation 

• Straight Helical Design: The original design was a straight coil compression spring (now discontinued and replaced by flared design 05147863) 

• Compression Spring Configuration: Helical spring designed to work in compression, pushing the outlet poppet against its seat to maintain a closed position when the intensifier is in the intake stroke

• Lightweight: Product weight of approximately 0.002 lbs (0.001 kg) 

• OEM Compatibility: Original OEM part number for KMT AccuStream waterjet systems 

• Cross-Reference Part Numbers: Replaces or cross-references with 1-11330, 5000127, 103674, 6103674, 100112, 20460033, and 05147863 (replacement) 

Maintenance:

• Critical Discontinuation Notice: This part (49894116) has been discontinued. The direct replacement is the flared spring (05147863) . Do not attempt to source the original straight spring; always use the upgraded flared design when servicing the sealing head assembly

• Design Issue Awareness: The original straight spring design could become wedged inside the outlet poppet during operation . The flared replacement spring (05147863) was specifically redesigned to eliminate this mechanical interference issue 

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

• 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 visible deformation, cracking, loss of spring force, or corrosion is detected. A weak spring may cause delayed valve closing, pressure fluctuations, or incomplete sealing

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

• Full Depressurization: Always fully depressurize the waterjet system (both hydraulic and high-pressure water circuits) and follow lockout/tagout procedures before removing the sealing head assembly or replacing the spring

• 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 

• Storage: Store spare springs in a clean, dry environment away from direct sunlight, ozone, or harsh chemicals to prevent material degradation