Balanced Zero Regulators for 150° F Service Selas Model BZR
Sensitive and accurate, the Selas BZR zero regulator delivers gas at a precise balanced pressure, even with slight inlet pressure variations. Model 5101 - BZR
The Selas BZR zero gas regulator is designed for ambient temperatures up to a continuous operating range of 150° F. For precise control of heated gases or higher ambient operating conditions, Models BZR-300, BZR-500 and BZR-700 are available.
Balanced zero regulators feature a rugged, large diaphragm actuated valve assembly, sensitively balanced at near zero pressure. Gas flow is initiated by a very small pressure differential across the main diaphragm. Gas supply is precisely modulated on system demand by negative or positive signals from suction mixers or controlled pressure from an external source.
Sensitive and accurate, the BZR zero gas regulator delivers gas at a precise pressure, even with slight inlet pressure variations. The patented regulator design assures highest accuracy over full flow range: With no friction between sensitively counterbalanced parts, fast, positive response is assured.
The BZR regulator assures dependable, precise gas flow control on all types of combustion systems including proportioning pre-mixers, nozzle mixers and mixing tees at positive or negative combustion chamber pressures.
NOTE: Now available in a smaller 1/2″ pipe size.
Capacity Table:
| Model Number |
Pipe Size | SCFH Gas Flow @ 4.0″ W.C. Pressure Drop | ||||
| Pipe Inlet Size |
Pipe Outlet Size |
MFD. 0.4 Sp. Gr. |
NAT. 0.6 Sp. Gr. |
AIR 1.0 Sp. Gr. |
L.P. 1.5 Sp. Gr. |
|
| 4 – BZR | 1/2″ | 1/2″ | 550 | 450 | 350 | 280 |
| 6 – BZR | 3/4″ | 3/4″ | 790 | 650 | 500 | 410 |
| 8 – BZR | 1″ | 1″ | 1,580 | 1,290 | 1,000 | 820 |
| 12- BZR | 1-1/2″ | 1-1/2″ | 3,160 | 2,580 | 2,000 | 1,640 |
| 16 – BZR | 2″ | 2″ | 5,530 | 4,520 | 3,500 | 2,860 |
| 20 – BZR | 2-1/2″ | 2-1/2″ | 7,900 | 6,450 | 5,000 | 4,100 |
| 24 – BZR | 3″ | 3″ | 12,600 | 10,300 | 8,000 | 6,500 |
| 32 – BZR | 4″ | 4″ | 22,100 | 18,100 | 14,000 | 11,400 |
Features and Benefits
- Accuracy: Low – Flow: 0.1 W.C., Full – Flow: 0.3 W.C.
- Turndown up to 200:1
- Operating temperatures to 150 °F
- All units factory tested and sealed before shipment
- Maximum inlet pressure: 2.0 psig
- Maximum pressure differential: 14.0 W.C.
- Sensitivity – Responds to signal pressure differential as low as 0.04 W.C.
DIMENSIONS: 1/2″ – 3″ SIZES
| Model Number | A | B | C | D | E | F | G | H | J | K | L | Wt Lbs. |
| 4 – BZR | 1/2 | 1/2 | 1-3/4 | 3-3/4 | 7 | 8-3/4 | 3-1/2 | 1-3/4 | 2-1/8 | — | 1 | 3.1 |
| 6 – BZR | 3/4 | 3/4 | 2-1/2 | 5 | 8-1/4 | 11-1/4 | 4-7/8 | 2 | 2-3/4 | 1/8 | 1-1/4 | 6.5 |
| 8 – BZR | 1 | 1 | 2-3/8 | 4-3/4 | 9-3/4 | 11-3/4 | 4-3/4 | 2 | 3-3/8 | 1/8 | 1-1/4 | 8.5 |
| 12 – BZR | 1-1/2 | 1-1/2 | 3 | 6-1/2 | 11-3/4 | 15-3/4 | 7-1/4 | 3-1/4 | 3-7/8 | 1/8 | 1-3/8 | 15.5 |
| 16 – BZR | 2 | 2 | 3-1/2 | 7-1/2 | 11-3/4 | 16-1/8 | 8-1/8 | 3-7/8 | 3-7/8 | 1/8 | 1-3/8 | 20.0 |
| 20 – BZR | 2-1/2 | 2-1/2 | 4 | 8-3/4 | 14 | 17-5/8 | 8-3/4 | 3-5/8 | 3-5/8 | 1/8 | 1-7/8 | 50.0 |
| 24 – BZR | 3 | 3 | 5-3/4 | 11-1/2 | 14 | 20-3/8 | 10-5/8 | 4-5/8 | 3-5/8 | 1/8 | 1-7/8 | 60.5 |
NOTES:
1. Spring housing must be perpendicular to pipe run in an upright position
2. Gas pipe run must be horizontal and level
3. Designed to accept standard 4” ANSI flanges
4. All dimensions are in inches
ORDERING INFORMATION
1. Specify Inlet and Outlet Pressure
2. Type of Gas, Flow, Specific Gravity and Temperature
3. Specify Model Number and Quantity
4. Shipping Instructions
