Product Name: O-Ring (Sealing Head Assembly) – Part No. 80077241

Description:
This component is an O‑ring specifically designed for the sealing head assembly (also known as the check valve assembly) in the high-pressure intensifier pump of a waterjet cutting system . According to manufacturer parts documentation, this O‑ring is listed as Item 9 in Table 12‑3 of the Sealing Head Assembly 20458908, with a quantity of 2 required per assembly .

The sealing head assembly is a critical component responsible for maintaining a watertight seal in ultra‑high pressure environments, typically up to 60,000 PSI or higher . The O‑ring (80077241) functions as a static seal between the fixed components of the sealing head body, the gland, the poppet retainer, and the other internal valve parts. It prevents high‑pressure water from leaking between these stationary mating surfaces .

In the complete sealing head assembly, this O‑ring works in conjunction with the body (20458098), gland (20457381), seat (20458140), poppet retainer screw (20458089), inlet poppet (20457948), discharge poppet (20460048), poppet pin (05116751), poppet retainer (20458896), and compression spring (20460033) . The sealing head assembly directs pressurized water from the intensifier through the nozzle without leaks, which is essential for cutting efficiency and operational safety .

This O‑ring is also included as a standard component in the Sealing Head Repair Kit 20458830, which contains items 3, 4, 5, 6, 8, 9, and 10 of the assembly .

Applications:

• Provides static sealing between fixed components within the sealing head assembly of waterjet intensifier pumps

• Prevents high‑pressure water leakage at the interfaces of the sealing head body, gland, and poppet retainer

• Used during scheduled preventive maintenance, major pump overhauls, or when sealing head leakage is detected

• Suitable for 60,000‑90,000 PSI (approximately 4,137‑6,480 bar) waterjet systems

Features:

• Precision‑Molded Dimensions: Manufactured to exact OEM tolerances for a perfect fit within the designated seal groove

• High‑Pressure Elastomer Material: Formulated from wear‑resistant rubber compounds (typically Viton/FKM or Buna‑N) to withstand extreme pressure cycling, temperature variations, and chemical exposure

• Static Sealing Application: Specifically designed for non‑moving (static) interfaces where precision fit and sealing integrity are essential

• Critical Consumable Component: Designed for single‑use application and periodic replacement during sealing head service

• Repair Kit Integration: Included as a standard component in Sealing Head Repair Kit 20458830 

Maintenance:

Failure Diagnosis (When to Replace) :

• External Water Leakage: Visible water weeping from the sealing head body or around the gland interface indicates O‑ring failure requiring immediate replacement 

• Pressure Drop: Inability to maintain rated cutting pressure may indicate seal degradation or compression set loss

• Visible Damage During Inspection: Inspect the O‑ring for signs of nicks, cuts, flattening (compression set), hardening, or cracking when the sealing head is disassembled

• Scheduled Preventive Maintenance: According to manufacturer maintenance guidelines, seals and O‑rings should be replaced at the first sign of wear or during scheduled overhauls to prevent leaks 

Replacement Guidelines :

• Single‑Use Component: The O‑ring is a consumable sealing element. Always replace with a new one whenever the sealing head assembly is disassembled during maintenance 

• Full Depressurization (Critical): Before any maintenance, place the main electrical disconnect in the OFF position, bleed down all high‑pressure lines, and follow lockout/tagout procedures. Severe injury can result if the machine is not properly locked out 

• Clean Installation: Perform the rebuild in a designated clean area. Thoroughly clean the O‑ring groove and all mating surfaces with a soft cloth. Remove all debris, old seal residue, mineral deposits, and corrosion 

• Groove Inspection: Inspect the seal groove for nicks, burrs, sharp edges, or damage that could cut or abrade the new seal

• Lubrication: Apply a thin, uniform layer of manufacturer‑recommended high‑pressure grease (e.g., FML‑2) to the O‑ring during installation to prevent pinching, rolling, or tearing during assembly 

• Seating Verification: Ensure the O‑ring is correctly seated in its groove without twisting or warping before reassembling mating components

• Torque Compliance: When reinstalling the sealing head and gland components, tighten all retaining hardware to the specific torque values listed in the equipment service manual to ensure proper O‑ring compression without over‑compression or damage

• Replace as a Set: When servicing the sealing head assembly, it is recommended to replace all O‑rings and seals simultaneously using the complete Sealing Head Repair Kit 20458830 

Cross‑Reference Information:

• H2O Jet / KMT / AccuStream #: 80077241

• Item 9 in Sealing Head Assembly 20458908 (quantity: 2)

• Included in Sealing Head Repair Kit 20458830