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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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
|
BENEFITS
|
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) =
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
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° |
||
7" w.c. (17.5 mbar) B34 MODEL CAPACITY TABLE - 1" w.c. Droop
7" w.c. (17.5 mbar) - 1" w.c. 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: 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) - 2" w.c. 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: 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 - 2% Abs. Droop
1 PSIG (69 mbar)
| 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 - 2% Abs Droop
2 PSIG (69 mbar)
| 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 - 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
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.