Identifying Valves Used in Sigma Products (SB1001.01)

Decision Tree for Identifying Valve Bodies without Body Stamps
“D” size
What size valve is it?
The smaller valve is a “B”
valve and measures roughly
1¼” (32mm) in diameter and
2³⁄₈” (60mm) tall. The larger
valve is a “D” valve, it measures
roughly 1⁵⁄₈” (41mm)
diameter and almost 3”
(76mm) tall.
“B” size
Image 1-42
“B” size valve - go to Page 17
“D” size valve
Where is the Outlet?
If the outlet is on the
bottom you have a
L–CO 2
valve - If the
Outlet is on the opposite
side of the Inlet you
have a L–N 2
valve.
Image 1-43
Outlet is on the bottom - valve is
a L–CO 2
valve. If your valve has
the Outlet on the bottom and
has a body ID stamp and
wrench flats see Page 15.
Outlet is on the opposite side of
the Inlet - valve is a L–N 2.
Small or large orifice?
The valve on the left has a tiny ³⁄₆₄ orifice, while the
one on the right has a ³⁄₃₂ orifice.
This is an L–N 2
valve Sigma
35305-309 (“D” 225 psi
MOPD L–N 2
valve)
(D2024-S15).
Refer Service note: This
valve was used for refer units
when fitted with black o-ring
plunger guide seal and black
faced plunger.
Image 1-44
The small orifice ³⁄₆₄ valve
is a Sigma 35325-329
(“D” 1000 psi MOPD
L–CO 2
valve)
(D2011-S25).
The large orifice ³⁄₃₂ valve
is a Sigma 35315-319
(“D” 300 psi MOPD L–CO 2
valve) (D2013-S39).
SB1001.01-16