ISTEC Corporation, your Flow Measurement and Control Specialist
 

ISTEC CORPORATION
Flow Measurement & Control
5 Park Lake Road, Unit 6
Sparta, NJ 07871 USA
Tel 973-383-9888
Fax 973-383-9088
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Model B34 Series Commercial Gas Regulator B34 Series Commercial Gas Regulator

Appropriate for light commercial and industrial uses where inches of water column or pounds delivery is desired such as utility services, and small to medium sized furnaces and boilers. The rapid response of the B31 is particularly well suited for applications where sudden on/off loads could cause shock problems.

FEATURES
  • Interchangeable Brass Orifice
  • 78 in2 of Diaphragm Area
  • Spring-loaded Internal Relief Valve Assembly
  • Field Interchangeable Adjustment Spring
  • Controlled Size Breather Orifice Eliminates Pulsation and Provides Normal Actuation at Low Flows
  • Wide Range of Valve Body Sizes including NPT and Flange Connections
BENEFITS
  • Economical
  • Lightweight
  • Protects Equipment from Shock Damage
  • Large 12" Diaphragm for Better Outlet Pressure Control
  • Unmatched Over-pressure Protection with Internal Monitor plus Internal Relief (IMR) Option
B34N
A spring loaded self-operated regulator with no internal relief, an adjustable loading ring for controlled boost at higher flows, and a precision breather opening to ensure proper stability for all conditions. This regulator can be used on low or intermediate inlet pressures where an internal relief, or other type of over-pressure protection device is not required.
B34R
The internal relief version of the B34 Series. This model features an adjustable loading ring for controlled boost at higher flows, a precision breather opening to ensure proper stability for all conditions, and a 1" internal relief valve.
B34DN
A standard B34N with a closed throat, downstream control tap on the bottom of the lower diaphragm case, and no internal relief capabilities. This unit is used when it is desirable to control the regulator from points other than the valve outlet. Since the control point is no longer at the outlet of the valve body the regulator does not boost, but all of the capacity tables are the same as the R and N models.
B34DR
The same as the B34DN, except it has internal relief similar to the B34R.
B34MN
Very similar to the B34DN with a closed throat, downstream control line, and no internal relief capabilities, except for an O-ring seal on the valve stem through the throat to assure positive downstream control when installed ahead of a downstream regulator. Used in a series monitoring installation as the upstream regulator, this unit gives customers an operating device that assumes control over an operating regulator when failure is sensed by the control line of the monitor. This series system assures maximum safety with uninterrupted service. The monitor regulator is set to take over control from the operating regulator with only a slight increase in outlet pressure.
B34MR
The same as the B34MN, except it has internal relief similar to the B34R. Option Designations N – No Internal Relief R – Internal Relief DN – Downstream Control with no Internal Relief DR –Downstream Control with Internal Relief MN –Monitor with no Internal Relief MR –Monitor with Internal Relief IMR –Internal Monitor with Internal Relief* IMN –Internal Monitor with no Internal Relief* IMRV – Internal Monitor with Internal Relief and Vent,
OPTION DESIGNATIONS
N
No Internal Relief
R
Internal Relief
DN
Downstream Control with no Internal Relief
DR
Downstream Control with Internal Relief
MN
Monitor with No Internal Relief
MR
Monitor with Internal Relief
IMR
Internal Monitor with Internal Relief*
IMN
Internal Monitor with no Internal Relief*
IMRV
Internal Monitor with Internal Relief and Vent*

* Consult Your ISTEC Sales Representative for Internal Monitor Performance Data


Valve Body High Tensile Strength Cast Iron

Orifice Brass

Valve Seat Buna-N or Silicone (for Temperatures below -20°F)

Valve Stem Plated Steel

Lever Pin Stainless Steel

Lever Zinc and Dichromate-plated Steel

Upper Diaphragm Plate Zinc and Dichromate-plated Steel

Lower Diaphragm Plate Die Cast Aluminum

Diaphragm Buna-N and Nylon

Vent Valve/Seat Delrin/Buna-N

Vent Screen Stainless Steel

Adjustment Ferrule Die Cast Aluminum

Seal Cap Die Cast Aluminum

Diaphragm Case Die Cast Aluminum

Shipping Weight
24 lbs.
1 Regulator per Box

Correction Factors for Non-Natural Gas Applications

The B34 may be used to control materials other than natural gas. To determine the capacity of the B34 for gases other than natural gas, it will be necessary to multiply the values within the capacity tables by a correction factor. The table below lists the correction factors for some of the more common gases...


GAS TYPE SPECIFIC GRAVITY CORRECTION FACTOR (CF)

Air
1.0
0.77

Butane
2.01
0.55

Carbon Dioxide (dry)
1.52
0.63

Carbon Monoxide (dry)
0.97
0.79

Natural Gas
0.60
1.00

Nitrogen
0.97
0.79

Propane
1.53
0.63

Propane Air-mix
1.20
0.71

To calculate the Correction Factor for gases not listed in the above Table, it will be necessary to know the Specific Gravity of the Gas and use it in the formula...

Correction Factor (CF) = Correction Factor Formula

Where...
SG1 = Specific Gravity of the gas in which the capacity is published.
SG2 = Specific Gravity of the gas to be controlled.

SPRING DATA – Model B34

Spring Color Outlet Pressure Range

Orange 3.0" w.c. – 5.0" w.c.

Brown 4.0" w.c. – 6.5" w.c.

Green 5.0" w.c. – 8.0" w.c.

Black 6.5" w.c. – 13.0" w.c.

Purple 9.1" w.c. – 20.8" w.c.

Blue 15.0" w.c. – 28.0" w.c.

Silver 1.0 PSIG - 2 PSIG

Yellow 2.0 PSIG – 4.5 PSIG

Red-Nested 4.0 PSIG - 5.5 PSIG

White-Nested 4.8 PSIG - 7.3 PSIG

ORIFICE DATA - Wide Open Flow Coefficients and Maximum Pressures

Orifice Data

VALVE BODY SIZES


Inlet
Outlet
Straight Body (NPT)
Angle Body (NPT)

1-1/4"
1-1/4"
X
 

1-1/4"
1-1/2"
X
 

1-1/4"
2"
X
 

1-1/2"
1-1/2"
X
 
1-1/2"
2"
X
 
2"
2"
X
X
3"
3"
 
X

X indicates that the Valve Body is available in that configuration

 

Available Vent Sizes 1" Operating Temperature Range: -20°F to 150°F*
(Silicone Valve Seats available for applications below –20°F)

Loading Ring Position M & D Models - 0°

Other Available Option

R & N Models for <1 psig Set Point - 21° >1 psig set point - 0°


B34 Dimensions

7" w.c. (17.5 mbar) B34 MODEL CAPACITY TABLE - 1" w.c. Droop

7" W.C. (17.5 mbar) B34 Model Capacity Table - 1" W.C. Droop Table

7" W.C. (17.5 mbar) B34 Model Capacity Table - 1" W.C. Droop Table, continued

7" w.c. (17.5 mbar) - 1" w.c. Droop

Performance Chart and Relief Curves

TYPICAL PERFORMANCE CURVES
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Orifice Size: 1/4" x 3/8"
Spring: Green
Set Point 7.0" w.c. with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F
RELIEF CHARACTERISTIC CURVES - R Model Only
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Vent Size: 1" NPT
Set Point 7.0" w.c. with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F

14" w.c. (35 mbar) B34 MODEL CAPACITY TABLE - 2" w.c. Droop

14" w.c. (35 mbar) B34 Model Capacity Table - 2" W.C. Droop

7" W.C. (17.5 mbar) B34 Model Capacity Table - 1" W.C. Droop Table, continued

14" w.c. (35 mbar) - 2" w.c. Droop

Performance Chart and Relief Curves

TYPICAL PERFORMANCE CURVES
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Orifice Size: 1/4" x 3/8"
Spring: Purple
Set Point 14.0" w.c. with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7
RELIEF CURVES - R Model Only
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Vent Size: 1" NPT
Set Point 14.0" w.c. with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F

1 PSIG (69 mbar) B34 MODEL CAPACITY TABLE - 1% Abs. Droop

1 PSIG (69 mbar) B34 Model Capacity Table - 1% Abs. Droop

1 PSIG (69 mbar) B34 Model Capacity Table - 1% Abs. Droop, continued

1 PSIG (69 mbar) B34 MODEL CAPACITY TABLE - 2% Abs. Droop

1 PSIG (69 mbar) B34 Model Capacity Table - 2% Abs. Droop

1 PSIG (69 mbar) B34 Model Capacity Table - 2% Abs. Droop, continued

1 PSIG (69 mbar)

Model B34 Gas Regulator Performance Chart & Relief Characteristic Curves

TYPICAL PERFORMANCE CURVES
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Orifice Size: 1/4" x 3/8"
Spring: Silver
Set Point 1 psig with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F
RELIEF CURVES - R Model Only
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Vent Size: 1" NPT
Set Point 1 psig with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F

2 PSIG (69 mbar) B34 MODEL CAPACITY TABLE - 1% Abs. Droop

2 PSIG (69 mbar) B34 Model Capacity Table - 1% Abs. Droop

2 PSIG (69 mbar) B34 Model Capacity Table - 1% Abs. Droop, continued

2 PSIG (69 mbar) B34 MODEL CAPACITY TABLE - 2% Abs Droop

2 PSIG (69 mbar) B34 Model Capacity Table - 2% Abs Droop

2 PSIG (69 mbar) B34 Model Capacity Table - 2% Abs Droop, continued

2 PSIG (69 mbar)

Model B34 Gas Regulator Performance Chart & Relief Characteristic Curves

TYPICAL PERFORMANCE CURVES
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Orifice Size: 1/4" x 3/8"
Spring: Silver
Set Point 2 psig with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F
RELIEF CURVES - R Model Only
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Vent Size: 1" NPT
Set Point 1 psig with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F

5 PSIG (345 mbar) B34 MODEL CAPACITY TABLE - 1% Abs. Droop

5 PSIG (345 mbar) B34 Model Capacity Table - 1% Abs. Droop

5 PSIG (345 mbar) B34 MODEL CAPACITY TABLE - 2% Abs. Droop

5 PSIG (345 mbar) B34 Model Capacity Table - 2% Abs. Droop

TYPICAL PERFORMANCE CURVES
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Orifice Size: 1/4" x 3/8"
Spring: Red-Nested
Set Point 2 psig with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F
RELIEF CURVES - R Model Only
Type and Model: B34 R
Regulator:
Inlet Size: 2" NPT
Outlet Size: 2" NPT
Vent Size: 1" NPT
Set Point 1 psig with 40 psig inlet @ 200 scfh. All test results are reported at a base of 14.7 psia and 60°F

ASSEMBLY POSITIONS - All Models

Assembly Positions - All Models

ORDERING INFORMATION

Specify: Inlet and outlet connection size and body type, Model number, Outlet pressure desired, Inlet pressure range, Type of gas and maximum capacity in scfh required, Assembly position number, Vent Size, Special requirements such as tagging, 1/8" pipe, tap, wire seal, etc.

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