POSEIDON 3790 Setup guide

REPAIR INSTRUCTIONS FIRST STAGE REDUCING VALVE
3790 - First stage G 5/8”
3790-10 - First stage YOKE
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ANTI-FREEZE CAP
DIFFERENT CONNECTIONS
YOKE
G 5/8’’
SAFETY VALVE

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FIRST STAGE VALVE
3790
Secondary side:
1. Disconnect the low pressure
hose from the first stage valve
using a 13 mm open end
wrench.
2. Remove the o-ring (30) from the
low pressure hose with the o-
ring remover.
First stage valve with G 5/8’’:
3. Remove the locking screw (22)
with a 6 mm Allen wrench.
Remove the o-ring (24) and the
cup-filter (25) with o-ring (23).
First stage valve with Yoke:
3. Remove the knob (23) and the
protective cap (21). Remove the
locking screw (24) with a 6 mm
Allen wrench. Remove the cup
filter (26) and the o-ring (25).
4. Place the first stage valve with
the secondary side facing
upwards in the fixture.
30

FIRST STAGE VALVE
3790
Removal:
1. Remove the pressure adjusting
screw (1) with a 6 mm Allen
wrench and remove the spring
(2 and 3).
2. Remove the cover (4) using a
27 mm crowsfoot and the upper
diaphragm center (5).
First stage valve with G 5/8’’:
3. Remove the connection (26)
and the wheel (28) with a 6 mm
Allen wrench.
4. Remove the o-ring (27) with an
o-ring remover. Make sure the
sealing surfaces are not
damaged.
First stage valve with Yoke:
3. Remove the connection (27)
and the yoke (22) with a 6 mm
Allen wrench.
4. Remove the o-ring (28) with an
o-ring remover. Make sure the
sealing surfaces are not
damaged.
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FIRST STAGE VALVE
3790
Removal:
1. Remove the valve centre, upper (6)
and the diaphragm (7).
2. Remove the diaphragm centre,
lower (8) and the valve needle (9).
3. Remove the valve centre, lower
(10) and the o-ring (11) with an o-
ring remover. Make sure the
sealing surfaces are not damaged.
4. Remove the o-ring (12), only 3790,
from the valve centre, lower (10)
with an o-rings remover. Make sure
the surfaces are not damaged.
5. Remove the valve seat (14) and the
o-ring (13) with the assembly
drift A.
6. Remove the valve piston (15) and
the pressure spring (16).
7. Remove the washer, steel (17), the
o-ring (18) and the washer, teflon
(19) with an o-ring remover.
Make sure the surfaces, are not
damaged.
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FIRST STAGE VALVE
3790
Removal:
1. Remove the blind screw (29 and
31) with a 5 mm Allen wrench.
Remove the o-rings (30 and 32)
with an o-ring remover.
Make sure the sealing surfaces
are not damaged.
2. Remove the locking screw (35)
with a 4mm Allen wrench.
Remove the pressure spring (16)
and the valve piston (34).
3. Remove the valve sealing (33)
from the valve piston (34) with
an o-ring remover.
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Cleaning:
If corrosion or salt deposits occurs, place all metal parts in concentrated Hempocid* or 15%
Hydrochloric acid for about 10 minutes. Then rinse them thoroughly and blow dry with air. The
synthetic parts in the second stage must not be treated with solvent.They shall be cleaned in
freshwater only. *Hempocid = Acid Liquid Detergent Containing phosphoric acid (5-10%) and
bactericid for desinfectant cleaning.

FIRST STAGE VALVE,
3790
When servicing the regulator
the following parts should be
replaced:
(see chapter Servicekit)
1. All o-rings
2. Diaphragm
3. Cup filter
4. Valve seat
5. Washer
6. Valve sealing
Checking:
Check the following parts to make
sure the sealing surfaces are
undamaged. Also check that the
threads are not damaged.
1. The blind screws (29 and 3 1)
2. The valve housing (20)
3. Valve centre (10)
4. The connections (26 or 27)
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FIRST STAGE VALVE
3790
Assembly:
1. Install the o-rings(30 and 32) on
the blind screws (29 and 31).
Lubricate the outlets.
2. Screw the blind screws in the
LP-HP outlets. Use a 5 mm
hexagon spanner and tighten
up by hand.
First stage valve with G 5/8’’:
1. Install the o-ring (27) on the
connection (26). Lubricate the
o-ring and the thread.
2. Install the wheel (28) on the
connection.
3. Screw the wheel connection
assembly into the valve housing
assembly with a 6 mm Allen
wrench.
First stage valve with Yoke:
1. Install the o-ring (28) on the
connection (27). Lubricate the
o-ring and the thread.
2. Install the yoke (22) on the
connection.
3. Screw the wheel connection
assembly into the valve housing
assembly with a 6 mm Allen
wrench.
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FIRST STAGE VALVE
3790
Assembly:
1. Lubricate the valve housing (20).
2. Place on the assembly drift A:
-washer, steel (17)
-O-ring (18)
-washer, teflon (19)
3. Install the valve housing.
Lubricate the washers
and the o-ring.
4. Install the o-ring (13) on the
valve seat (14).
5. Install the o-ring (12), on the
valve centre, lower (10).
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12

FIRST STAGE VALVE
3790
Assembly:
1. Place on the assembly fixture B:
- valve centre, lowér (10)
- o-ring (11), lubricate
- valve seat (14) with o-ring
downwards
- valve piston (15), lubricate,
and pressure spring (16) on valve
piston.
2. Install the valve housing (20).
3. Turn the valve housing (20) with
the secondary side upwards.
4. Install the valve needle (9).
5. Install the lower diaphragm centre
(8).
6. Install the diaphragm (7) in the
valve centre, upper, convex part up
(6). Install the valve housing (20).
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FIRST STAGE VALVE
3790
Assembly:
1. Install the diaphragm centre,
upper (5) in the valve housing
(20).
2. Grease the thread on the cover
(4) and tighten up by hand.
3. Check to make sure that the
parts are correctly installed by
pressing at the valve centre. It
should move approximately
2 mm (1/16’’).
4. Lubricate both ends of the
spring (2 and 3) and install.
Lubricate the thread on
pressure adjusting screw (1),
and tighten 7 turns with a 6 mm
Allen wrench.
5. Install the valve sealing (33) on
the valve piston (34).
6. Install the valve piston (34) and
the pressure spring (16). Install
the locking screw (35) with a 4
mm Allen wrench. Tighten up by
hand.
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FIRST STAGE VALVE
3790
Assembly:
1. Place the valve housing (20) in a
fixture.
2. Tighten the cover for valve
housing with a torque wrench
(30 Nm) and an open ended
insert tool 27 mm.
3. Tighten the connection with a
torque wrench (30 Nm) and
holder insert tool/ bits.
IMPORTANT! Use bits nr 3119
(L = 40 mm).
First stage valve with G5/8’’:
4. Put o-ring (23) on the cup type
filter (25). Install them and the
o-ring (24) and the locking
screw (22) in the connection
(26). Tighten with a Allen
wrench 6 mm.
First stage valve with Yoke:
4. Put o-ring (25) on the cup type
filter (26). Install them and the
locking screw (24) in the
connection (27). Tighten with a
Allen Wrench 6 mm. Put the
protective cap (21) on the knob
(23). Lubricate and screw in the
knob.
5. Install o-ring (30) on the low
pressure hose. Lubricate the o-
ring and the thread.Tighten the
hose with a 13 mm open
wrench.
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