Description
Spirax Sarco BRV2S and BRV2B ductile iron pressure reducing valves are direct-acting pressure reducing valves for steam and gases such as compressed air. The valves feature ductile iron bodies and are available with flanged or threaded connections. BRV2S has a stainless steel bellows, while BRV2B has a phosphor bronze bellows. BRV2SP and BRV2BP models with external sensing lines are also available. Three downstream pressure ranges are identified by the color of the nameplate.
Available Models
| Model | SKU |
|---|---|
| 1/2” BRV2S GREY (0.14 - 1.7 bar g) | 0457300 |
| 1/2” BRV2S GREEN (1.40 - 4.0 bar) | 0457400 |
| 1/2” BRV2S ORG (3.50 - 8.6 bar g) | 0457500 |
| 3/4” BRV2S GREY (0.14 - 1.7 bar g) | 0458300 |
| 3/4” BRV2S GREEN (1.40 - 4.0 bar) | 0458400 |
| 3/4” BRV2S ORG (3.50 - 8.6 bar g) | 0458500 |
| 1” BRV2S GREY (0.14 - 1.7 bar g) | 0459300 |
| 1” BRV2S GREEN (1.40 - 4.0 bar) | 0459400 |
| 1” BRV2S ORG (3.50 - 8.6 bar g) | 0459500 |
Downstream Control Pressure Ranges
| Color | Pressure range |
|---|---|
| Grey | 0.14 - 1.7 bar g |
| Green | 1.40 - 4.0 bar g |
| Orange | 3.50 - 8.6 bar g |
Note: When pressure ranges overlap, the lower-range spring provides better control. The product fully complies with the European Pressure Equipment Directive 97 / 23 / EC and is supplied with CE marking where required. Standard products are supplied with a typical manufacturer’s test certificate. Specify any required certificates and testing requirements when placing the order.
Sizes and Pipe Connections
-
½”, ¾” and 1”: threaded BSP (BS 21 Rp) or NPT connections
-
DN15, DN20 and DN25: EN 1092 PN25 flanged connections
Pressure/Temperature Limits
| Item | Parameter |
|---|---|
| Valve body design conditions | PN25 |
| PMA maximum allowable pressure | 25 bar g @ 120 °C |
| TMA maximum allowable temperature | 210 °C @ 19 bar g |
| Minimum allowable temperature | -10 °C |
| PMO maximum operating pressure with saturated steam | 19 bar g @ 210 °C |
| TMO maximum operating temperature | 210 °C @ 19 bar g |
| Minimum operating temperature | 0 °C (consult Spirax Sarco below this temperature) |
| Maximum downstream set pressure | 8.6 bar g |
| Maximum differential pressure | 19 bar |
| Recommended maximum reduction ratio (at maximum flow) | 10 : 1 |
| Design maximum cold hydraulic test pressure | 38 bar g (with internal components installed, test pressure must not exceed 19 bar g) |
Materials
| Item No. | Component | Material |
|---|---|---|
| 1 | Spring housing | Aluminum - epoxy-coated LM24 |
| 2 | Adjustment handwheel | Polypropylene |
| 3 | Upper spring plate | Cast iron DIN 1691 GG 20 |
| 4 | Pressure adjustment spring | Silicon chrome BS 2803 685 A55, spring steel, stainless steel 316T/316L |
| 6 | Bellows assembly gasket | Stainless steel-reinforced exfoliated graphite |
| 7 | Spring housing bolt (M8 × 25mm) | Zinc-plated steel BS 3692 Gr. 8.8 |
| 8 | Valve body | Ductile iron DIN 1693 GGG 40.3 |
| 9 | Conical washer | Stainless steel ASTM A276 316L |
| 10 | Top spindle | Stainless steel ASTM A276 316L |
| 11 | Valve seat | Stainless steel BS 970 431 S29 |
| 12 | Valve seat gasket | Stainless steel BS 1449 316 S11 |
| 13 | Valve plug | Stainless steel AISI 420 |
| 14 | Valve plug return spring | Stainless steel BS 20056 316 S42 |
| 15 | Strainer screen | Stainless steel BS 1449 316 SH |
| 16 | Blanking plug | Stainless steel BS 970 431 S29 |
| 17 | Compression fitting assembly | Brass |
| 18 | Spring range color nameplate | Polypropylene |
| 19 | Diaphragm plate | Stainless steel 316L |
| 20 | Pin | Copper-plated low-carbon steel |
Note: Items 10, 11, 13, 14, 15 and 19 are components of a single assembly.
Flow Data for Safety Valve Sizing
Use full-open flow for safety valve sizing. Kvs values are: DN15 = 1.5, DN20 = 2.5 and DN25 = 3.0.
Conversion formulas:
-
Cv (US) = Kv x 1.156
-
Cv (UK) = Kv x 0.963
Weight
| Size | Threaded connection weight (kg) | Flanged connection weight (kg) |
|---|---|---|
| DN15 - ½” | 1.60 | 3.90 |
| DN20 - ¾” | 1.70 | 4.25 |
| DN25 - 1” | 1.95 | 4.65 |
Installation Instructions
Install the pressure reducing valve in a horizontal pipeline, observing the flow direction indicated by the arrow on the valve body. For BRV2SP/BRV2BP models using an external sensing line, remove blanking plug (16) and install the 6mm O/D compression fitting (17). The other end of the 6mm sensing line should be connected to the downstream pipe at least 1m from the valve.
Ordering Information
Order according to the descriptions in the available spares list, specifying the pressure reducing valve size, model and pressure range. For example: adjustment spring for a DN15 BRV2 pressure reducing valve, pressure range 3.5 - 8.6bar g (orange); 1 - DN15 BRV2S pressure reducing valve, ductile iron body, EN1092 PN25 flanged connection, stainless steel bellows and orange spring (3.5 - 8.6 bar g).
For detailed safety information, installation instructions and maintenance procedures, refer to the Installation and Maintenance Instructions (IM-P045-10) supplied with the product.
