© Miller Diving All Rights Reserved Document # 030715001
14
Remove the Valve Stem and Packing from the Manifold Body
.
WARNING: Never connect the main gas
supply hose from the diving station/umbilical
to the emergency valve. There is no one way
valve in the emergency valve. If this mistake is
made, any break in the supply hose could pos-
sibly result in a “squeeze”.
3-E FREEFLOW MANIFOLD
DESCRIPTION:
The Freeflow Manifold serves as an adjustable on/off
valve, supplying gas to the interior of the Helmet. Open-
ing the Freeflow Handle allows breathing gas to flow
into the Helmet interior where the Freeflow Muffler di-
rects it over the Face Plate to the diver and creates an
anti-fogging action. An angular passage within the
Freeflow Manifold allows the gas to bypass the on/off
system and flow through the Demand Tube to the De-
mand Regulator, unobstructed and independent of the
on/off valve system. Gas from either the supply umbili-
cal or from an emergency gas supply follows this pas-
sage to the Demand Regulator.
MAINTENANCE AND REPLACEMENT:
Simple maintenance may be carried out on the Teflon
Packing, Washers, Valve Stem without removing Mani-
fold Body from Helmet.
1. Remove Screw, Handle, Packing Nut. Then, unscrew
Stem and Packing.
5. Replace Teflon Packing or other worn parts.
6. To reassemble, screw Stem with Washers and Pack-
ing into Manifold Body, and secure with Packing Nut
.
7. Install the Handle on the Stem. Be sure the screw en-
gages the hole in the Stem.
8. Tighten the Packing Nut so that some resistance is felt
to rotation of Handle. Do not tighten excessively, but
the Nut must be tight enough so that no gas escapes
around Valve Stem. The Freeflow Muffler may be re-
moved from the inside of Helmet, cleaned or replaced
without difficulty. If necessary to remove the Manifold
Valve Body from the Helmet, proceed as follows:
9. The Face Plate and Face Ring must be removed for
access to Manifold Valve Nut and the small set screw
located under the faceplate. See section 3-B.
10. Remove Muffler and unscrew Manifold Nut. Back
out the set screw slightly, freeing the Manifold Body.
The Manifold Body may now be removed.
11. Remove old sealant from Helmet area and Manifold
Body.
12. Wash Manifold Body in warm soapy water, rinse and
air dry.
13. Inspect Body, Threads, and Seat for wear.
14. To reassemble, install a new O-ring on body.
15. Apply an approximately 1/8 inch layer of silicone
sealant over O-ring and base of thread area.
16. Install the Body in the Helmet. Run the Manifold
Nut in snug, then tighten the set screw against the Body.
Finish tightening the Manifold Nut.
17. Install Muffler. Be sure O-ring has not popped out of
its groove.
3-F
CHECK VALVE
DESCRIPTION:
Puncture or breakage of the supply umbilical or other
surface support equipment could create a suction inside
the Helmet which could result in serious injury to the
diver. The Check Valve is used to prevent reverse flow
2. Inspect all parts for wear.
3. Wash parts in soapy water. Rinse and air dry.
4. Lubricate threads with silicone grease.
