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Valve Maintenance Guide: ¾”-.1” Modification Overview

Learn how to perform maintenance on the ¾”-1”.350 valve including housing and check valve removal, disc replacement, and reassembly notes. Detailed step-by-step instructions provided.

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Valve Maintenance Guide: ¾”-.1” Modification Overview

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  1. 350, 350XL¾”- 1”

  2. Modification Overview • Production of the ¾”-1” 350 began in 2004 and is current. • The lead free version 350XL was introduced in 2010.

  3. Check Housing Removal • The plastic housing (vessel) must be removed for service. • There is no spring load. • Housing is bolted and o-ring sealed. • Remove the four housing bolts. • Lift the vessel up and out.

  4. Check Valve Removal • Check valve modules. • Modules are located inside the housing. • Modules are sealed by o-rings. • Both modules slide toward the outlet of the housing.

  5. Disassemble Check Module • Modules are spring loaded. • Locate the notch between the seat and tailpiece of each check. • Holding the module firmly, twist and snap apart with a screwdriver.

  6. Check Seat Removal • The check seat is free once the module has been disassembled. • If seat is damaged, the entire module must be replaced.

  7. Check Disc Replacement • The check disc and poppet are free once the module has been disassembled. • Disc and poppet must be replaced as one component.

  8. Check Valve Reassembly Notes • Reassemble in reverse order. • Lubricate o-rings on check modules and slide back into vessel. • Make sure checks are in the correct order and facing the correct direction.

  9. Housing Reassembly Notes • Lubricate the inlet and outlet o-ring on the vessel. • The vessel can only be installed in one direction. • Match the slight taper on the outlet of the housing with the taper in the body.

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