Page 37 of Propane and Natural Gas Equipment by National Energy Equipment, Inc.
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OPD (Over Fill Protection Device) Retrofit Table
OPD Function
The OPD will help reduce the potential for overfilling propane cylinders and minimize the
risk of hydrostatic relief valve discharges. As the cylinder is filled, the rising liquid level
lifts the float to a predetermined position (based on the proper valve selection) to prevent
dangerous overfilling.
Selecting the Proper OPD
When replacing cylinder valves with an OPD valve, use the table to the right to identify the
maximum liquid level dip tube length to be used based on the cylinder being re-valved.
If the dip tube length shown on the cylinder collar is not in the table, use the next longer
dip tube.
Valve Repair
OPD valve stems and handwheels are designed not to be repairable or replaceable.
This is a design standard to prevent inadvertent mixing of Non OPD valve parts with OPD
valve parts. All OPD valves have a triangular handwheel for easy identification.
Cylinder
Size
Material
Cylinder
ID
Cylinder Water
Capacity
Dip Tbe
Length
4.25#
Steel
8.9
10.2
3.3
5#
Steel
7.8
11.9
3.3
5#
Steel
8.0
11.9
3.3
5#
Steel
7.5
15.5
3.3
10#
Steel
8.9
26.1
3.6
11#
Steel
8.9
26.2
3.6
11#
Steel
12.0
26.2
3.3
11.5#
Steel
12.0
27.3
3.3
20#
Steel
12.0
47.6
4.0
25#
Steel
12.0
59.7
4.8
30#
Steel
12.0
71.5
4.8
40#
Steel
12.0
95.3
6.5
6#
Aluminum
6.0
15.0
4.8
10#
Aluminum
10.0
23.6
4.0
20#
Aluminum
12.0
47.6
4.8
30#
Aluminum
12.0
71.5
6.0
40#
Aluminum
12.0
95.2
7.0
QCC Type 1 Cylinder Valves
NEE
OPD
Dip Tube Length
Application
Repair Kit
PV3349ALG-6.5
No
6.5
40 Cylinders
3349-100-KIT
PV3349ALG-5.6
5.6
30 Cylinders
PV3349ALG-4.0
4.0
20 Cylinders
PV3349AB
None
20 -40 Cylinders
PVE3349PDLG-408
Yes
3.3
5#, 11# 12 diam Cylinders
Non-repairable
PVE3349PDLG-407
3.6
10#, 11# 9 diam Cylinders
PVE3349PDLG-406AD
6.5
40# Steel Cylinders
PVE3349PDLG-404AD
4.8
25#, 30# Steel, 6#, 20# Aluminum
PVE3349PDLG-402
4.0
20 Steel, 10# Aluminum Cylinders
Sherwood developed the QCC thread connection that has become the standard in the propane industry. The Sherwood OPD device is patented and believed to be the best
OPD module in the industry based on the compact non-float type design. These valves all have a 3/4 NGT tank connection and a 375 PSI relief valve setting suitable for
DOT containers up to 40 Lb capacity.
Features:
n A back check module that prevents the flow of gas unless a connection is made.
n Fast Purge design 2 minutes compared to about 12 minutes for the competitors valve.
n BTU outputs up to 2.6 Million BTU/Hr depending on tank pressure.
n A unique 1 5/16 right hand male ACME thread that is designed specifically for a thermally protected female connector.
n Internal POL threads to allow older POL devices to be connected.
n Relief valve capacity rated for cylinders up to 40 Lb
n OPD feature (when equipped mandatory in the USA) that provides an accurate filling level without the use of a float assembly.
n A triangular handwheel on OPD valves for easy identification.
PV3349
PDLG-406
QCC TYPE 1 CYLINDER VALVES
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