Kirby appendix Introduction, One Way Valve, Kirby Morgan 37

Kirby Morgan 37 & 57

Chapter 7.0

Breathing System Maintenance and Repairs

7.1 Introduction

This chapter covers the maintenance and repair of all components of the breathing system. The breathing system includes the one way valve, the emergency valve, the side block, the bent tube assembly, the demand regulator, and the oral/nasal mask.

The breathing systems on all Kirby Morgan helmets and masks are simple and highly reliable. The fact that they can continue to operate when the components are not in a well-maintained condition can cause divers to become complacent about maintenance.

Your life depends on the correct function of this equipment!

While Kirby Morgan helmets and masks are simple to maintain, like any type of life support equipment, they do require regular periodic maintenance to func- tion properly.

All parts disassembled should be thoroughly cleaned using the methods described in the Appendix in the rear of this manual. Components that require the use of lubricants, sealing and thread locking compounds should also be maintained.

Most fasteners have a torque value, it is imperative that all fasteners which have a torque value be tightened to the torque specifications as outlined by the proce- dure, or as listed in appendix 1. If in doubt as to the proper torque setting, contact your local authorized repair facility or KMDSI.

7.2 One Way Valve

NOTE: The one-way valve assembly should be disas- sembled, cleaned and the three O-rings should be replaced at least annually. Damaged and/or corroded parts should be replaced. A repair kit is available for

replacement parts (525-330).

CAUTION

Use two wrenches or hold the hex part of the body in a vise while removing or turning the seat with a wrench. Do not use pliers on the main body of the one- way valve. You may damage the valve if pliers are used.

7.2.1Disassembly Of The One Way Valve

Tools Required: Soft Jaw Vice

1 inch Open End Wrench Attachment on Torque Wrench

(If no vise is available use a backup 1 inch open end wrench)

To disassemble and inspect the one way valve as- sembly:

1)The one way valve assembly must be removed from the side block. Use the open end wrench to remove it.

2)After the one way valve has been removed, use two wrenches or hold the hex part of the body in a soft jaw vise while removing the seat with a wrench.

As the seat is removed, the wiper and the O-ring will slide out in place in a groove on the seat. The

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