Description
Product Overview
Spirax Sarco SB and SBRA series are self-acting temperature control valves. They are used in conjunction with Spirax Sarco SA control systems to provide a self-acting temperature control unit for heating and cooling applications. The SB model is a normally open, single seat valve, while the SBRA model is a normally closed, single seat valve available with or without a bleed hole.
Key Features
- Constructed with a gunmetal body (BS 1400 LG2) and stainless steel valve plug and seat ring (BS 970 431 S29).
- Available in normally open (SB) and normally closed (SBRA) configurations.
- Complies with the requirements of the Pressure Equipment Directive (PED).
- Optional extra bleed hole bypass and fusible device available for SBRA models.
- Maximum operating temperature of 232 °C (450 °F) when fitted directly to an actuator.
Technical Specifications
| Specification | Value |
|---|---|
| Sizes | DN15 (1/2”), DN20 (3/4”), DN25 (1”) |
| Pipe Connections | Screwed BSP (BS 21 parallel) or NPT |
| Body Design Conditions | PN25 |
| Maximum Design Pressure | 25 bar g @ 120 °C (363 psi g @ 248 °F) |
| Maximum Operating Temperature | 232 °C (450 °F) fitted directly to an actuator |
| Minimum Operating Temperature | 0 °C (32 °F) |
| Maximum Differential Pressure (SB) | DN15: 17.2 bar, DN20: 10.3 bar, DN25: 6.8 bar |
| Maximum Differential Pressure (SBRA) | DN15: 12.0 bar, DN20: 7.0 bar, DN25: 4.7 bar |
| Kv Values | DN15: 2.58, DN20: 3.86, DN25: 6.80 |
Applications
- Used in conjunction with Spirax Sarco SA control systems.
- Heating control systems utilizing the SB normally open valves.
- Cooling control applications utilizing the SBRA normally closed valves.
