On/Off Valve II Subassembly

The On/Off Valve II Subassembly with 90° fitting is a 60,000 psi Flow high-pressure valve assembly used to control jet start and stop at the cutting head. The integrated right-angle fitting provides a compact outlet connection where straight routing is not ideal, helping reduce tube strain and simplify alignment between the valve and downstream cutting head components. This assembly is typically replaced when the valve is leaking, slow to shut off, damaged at the outlet fitting, or no longer providing clean, repeatable waterjet stream control.

Individual components from this assembly:

• Instajet II On/Off Valve Actuator Assembly (003840-1) — actuates the valve body to open and close the high-pressure water stream.
• InstaJet On/Off Valve Seal Retainer Assembly (004096-1) — retains the sealing components inside the on/off valve assembly.
• Weep Hole Tube 3/16 Inch OD (003845-1) — provides the weep path used to identify leakage past internal valve seals.
• UHP Seal Fluoroloy-G 1/4 Inch Diameter (003831-1) — restores high-pressure sealing performance inside compatible on/off valve assemblies.
• Back-Up Ring (003832-1) — supports the primary seal and helps prevent extrusion during high-pressure cycling.
• Poppet Sleeve Bearing (003838-1) — guides the poppet for consistent movement and reliable shutoff response.
• 60K On/Off Valve II Body (010104-1) — the main 60K valve body used with Flow Mach 2b systems and legacy machines.
• On/Off Valve II Poppet (010105-1) — works with the valve seat to create a clean, repeatable shutoff.
• On/Off Valve Seat Poppet (006933-1) — provides the carbide-faced sealing surface inside the valve body.
• 70 Durometer Black Nitrile O-Ring (A-0275-014) — seals low-pressure and static interfaces in compatible Flow valve assemblies.
• Silicone Dipped High Resiliency O-Ring (B-8075-007) — provides resilient sealing support where rebound and tear resistance are important during installation.
• Safety Relief Valve (A-18736) — used as a pressure-relief component in compatible system plumbing.
• Blue Lubricant 2 Ounce (A-2185) — supports proper installation and future serviceability of threaded high-pressure components.
  

Other related products:

• On/Off Valve II Maintenance Kit (001959-1) — includes common sealing and wear components used to rebuild compatible Flow on/off valve assemblies.
  
• On/Off Valve Cutting Head Adapter 90 Degree (044866-1) — provides a leak-resistant right-angle connection between the valve outlet and cutting head assembly.
• 60K Cutting Head Assembly (010747-1) — pairs downstream of the on/off valve to complete the high-pressure cutting head stack.
• 60K Standard On/Off Valve Normally Closed Air to Open (C-2728-1) — a related 60K on/off valve configuration for standard normally closed operation.

Service note: Inspect the seat, poppet, seals, outlet fitting, and mating cutting head connection before installation. A worn seat or damaged cone-and-thread connection can cause leakage, delayed shutoff, or inconsistent piercing even when the valve assembly itself is new.