Cast iron thermostatic valve ESBE
Code: P0021
Product detailed description
Thermostatic valves are essential components in solid fuel boiler systems where temperature control is critical to prevent damage from cold return flows. This device is typically installed in central heating circuits serving residential or commercial buildings with atmospheric boilers. Installers working on such systems will encounter this type of valve when ensuring proper thermal protection and system balance.
The valve acts as a safety mechanism in the event of reduced heat demand, preventing cold water from entering the boiler and causing condensation or thermal stress. It is commonly found in systems where the boiler operates with variable load conditions, such as in larger properties with multiple zones or seasonal usage patterns.
Technical parameters
| Nominal bore | DN 25 |
|---|---|
| Weight | 1 kg |
| Code | P0021 |
| Brand | ESBE |
Installation and connection
Installers should ensure the valve is fitted using its internal thread to a compatible DN25 pipe. Prior to installation, verify that the system pressure does not exceed 10 bar and that the media temperature remains within the operational range of 0°C to 110°C. A common mistake during installation is neglecting to align the valve in the correct flow direction, which can compromise its function. Always check the sealing surfaces for debris and apply a suitable sealant if required by the system design.
Compatibility and accessories
This thermostatic valve is intended for use with solid fuel boilers in atmospheric systems. No additional accessories are required for standard installation. Ensure that all connecting pipework and fittings are compatible with the cast iron construction and thermal cycling expected in the application. No related products are available for this model.
Technical background for designers
The operating principle involves a temperature-sensitive element inside the valve that expands when the return water temperature drops below 70°C. This expansion triggers the valve to close, preventing cold water from reaching the boiler. The valve integrates into the system via a simple mechanical linkage, making it suitable for non-electric control applications. Long-term performance depends on consistent media quality and absence of particulate matter in the flow.
Service and operation
Regular visual inspections are recommended to ensure the valve remains free from blockages and that the sealing surfaces remain intact. No scheduled service intervals are defined in the technical documentation. During operation, confirm that the valve opens at the specified temperature and closes fully when the return temperature rises above the threshold. Any deviation from normal function should be investigated immediately to avoid potential boiler damage.
Frequently asked questions
Can the valve be used with a boiler operating above 110°C?
No. The maximum allowable media temperature is 110°C according to the technical specifications.
Is this valve suitable for connection to copper or steel pipework?
Yes, provided the internal thread is compatible with DN25 pipe dimensions.
Does the valve require electrical power to operate?
No. It functions purely mechanically based on temperature changes in the return flow.
Can the opening temperature be adjusted after installation?
No. The opening temperature is fixed at 70°C and cannot be modified.
Documents for download
Additional parameters
| Category: | Other |
|---|---|
| Warranty: | 2 years |
| Nominal diameter: | DN 25 |
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