Identifying Valves Used in Sigma Products (SB1001.01)

L–CO 2
valve identification
Sigma has used a variety of custom L–CO 2
valves. There
are two sizes as shown in the image 1-28.
The smaller valve is known as a “B” size valve, measures
roughly 1¼” (32mm) in diameter and 2³⁄₈” (60mm) tall.
The larger valve is a “D” size valve, it measures roughly
1⁵⁄₈” (41mm) diameter and almost 3” (76mm) tall.
“D” size
“B” size
If you have a “D” size valve, skip to page 14.
“B” L–CO 2
valve identification
“B” size L–CO 2
valves are available in two pressure ratings,
300-350 psi MOPD, and 1000 psi MOPD. The only
difference between 300 psi valves and 1000 psi valves is
the size of the orifice in the valve. The 300 psi valve has
a ³⁄₃₂” orifice and the 1000 psi valve has a ³⁄₆₄” orifice.
D & B size valves
Image 1-28
The relative orifice size is readily apparent by looking
either at the outlet port on the bottom of the valve (image
1-29), or at the valve seat/orifice inside the valve if it is
open (image 1-30).
Valves made before the summer of 2001 were labeled
300 psi MOPD B2023-S13
1000 psi MOPD B2021-S9
If the label is still intact, that number is all you need to
identify the valve – go to page 23.
300 PSI orifice from
bottom
Image 1-29
1000 PSI orifice
from bottom
300 PSI orifice from
seat side
1000 PSI orifice
from seat side
Image 1-30
SB1001.01-12