Description
Spirax Sarco KBV21 manual boiler blowdown valve consists of a carbon steel ball valve with reinforced PTFE seats and a stainless steel manual handle. The manual handle is available in two types: a standard handle and an extended T-handle. Both the standard handle and T-handle are supplied separately. The manual handle cannot be removed when the valve is open and can only be removed when the valve is closed, ensuring compliance with boiler regulations. This boiler blowdown valve is specifically designed for boiler blowdown applications and is particularly suitable for systems that do not require timed blowdown.
Applications
Specifically designed for boiler blowdown applications, particularly systems that do not require timed blowdown. Refer to separate documentation for timed blowdown systems.
Features
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Designed for boiler blowdown applications
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Suitable for boiler pressures up to 17.25bar g at 208℃
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Size range DN25 - 65
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Handle can only be removed when the valve is closed
Sizes and Pipe Connections
DN25,32*,40,50,65. Flanged connections, BS4504 PN40 or BS1560 Class 300. *DN32 is available only with PN40.
Limiting Conditions
| Maximum allowable pressure | 17.25 bar g at 208 °C |
|---|---|
| Cold hydraulic test pressure | 60 bar g (air, water) 78 bar g (class 300) |
| Valve seat leakage test | 6 bar g (air, water) |
Materials
| Component | Material |
|---|---|
| Body | Carbon steel ASTM A216 WCB |
| Seat and stem seal | Reinforced PTFE |
| Ball | Austenitic stainless steel AISI 316 |
| Stem | Stainless steel AISI 420 or 316 |
| Sleeve | Austenitic stainless steel AISI 316L |
| Connector | Austenitic stainless steel AISI 316L |
| *Standard handle | Austenitic stainless steel AISI 316L |
| *T-handle | Carbon steel |
| Note: The standard handle and T-handle are supplied separately. |
Weight (Approximate)
| DN25 | 6.0kg |
|---|---|
| DN32 | 7.5kg |
| DN40 | 9.8kg |
| DN50 | 12.0kg |
| DN65 | 18.0kg |
Product Description
Spirax Sarco KBV21 manual boiler blowdown valve with a carbon steel body and flanged connections. The standard handle or T-handle is supplied separately and complies with boiler room regulations. The blowdown valve is operated using a locking mechanism with austenitic stainless steel internal components.
Ordering Information
Example: 2 - Spirax Sarco KBV21 boiler blowdown valve, DN40, flanged BS4504 PN40 connection.
1 - KBV 20 standard handle
Available Spares
Complete spare parts kits are available, including all seals and gasket components, as well as reinforced PTFE stem seals. Stems are also available. When ordering, specify the valve model, application (such as boiler blowdown), and size (DIN).
