Gestra CW44 is a straight-through, direct-acting proportional cooling water limiting valve (return-water temperature control valve). The valve features a forged steel C 22.8 body and EPDM seals, with a pressure rating of PN 25 (maximum operating pressure 25 barg). It is available with G3/8 to G1 BSP threaded female connections and supports outlet temperature adjustment from -2 to +106 °C. It is designed specifically for outlet temperature limiting control in equipment cooling water circuits and automatically adjusts the flow rate to meet the specified control requirements.
Gestra cooling water limiting valve CW44 product image
1 / 1
CW44 Cooling Water Temperature Limiting Valve | Gestra
Straight-through, direct-acting proportional cooling water flow limiter with BSP threaded sockets from G3/8 to G1, automatically regulating flow according to outlet temperature.
Genuine product assurance
We can help verify product data and purchasing details.
Model confirmation
Confirm model, connection and key options before ordering.
After-sales support
After-sales communication support is provided according to the order agreement.
Specifications
- Applicable medium
- Cooling water
- Control method
- Direct-acting proportional control
- Valve configuration
- Straight-through
- Maximum operating pressure
- 25 barg
- Maximum differential pressure
- 16 bar
- Connection type
- BSP threaded female connection
- Connection sizes
- G3/8, G1/2, G3/4, G1
- Pressure rating
- PN 25
- Adjustable outlet temperature
- -2 to +106 °C
- Maximum permissible short-term temperature
- 120 °C
- Temperature differential over full stroke
- 10.5 K
- Time constant
- 60 s
- Hysteresis
- 3 K
- Flow coefficient KvS
- 0.66 m³/h (G3/8, G1/2); 1.37 m³/h (G3/4, G1)
- Preset bypass flow rate
- 0.025 m³/h (G3/8, G1/2); 0.07 m³/h (G3/4, G1)
- Valve body material
- Forged steel C 22.8 (DIN No. 1.0460)
- Seal material
- EPDM
Application scenarios
Outlet temperature limiting control in cooling water circuits
CW44 can be installed in an equipment cooling water circuit and regulates the cooling water flow through direct-acting proportional control to meet the specified outlet temperature control requirements.
Installation & maintenance notes
Medium, pressure, differential pressure, and temperature limits
CW44 is suitable only for cooling water. The operating pressure must not exceed 25 barg, the maximum differential pressure must not exceed 16 bar, and the operating temperature must remain within the specified adjustable outlet temperature range.
Seal material compatibility
When servicing or replacing seals, verify that the EPDM material complies with the product specifications and is suitable for cooling water and the specified temperature range.
FAQ
How does the CW44 cooling water flow limiter control the return water temperature?
The CW44 is installed directly in the cooling water return line as a direct-acting proportional controller. Two adjusting screws are used to set the outlet temperature and the bleed flow, ensuring the outlet temperature is maintained at the preset value for stable operating conditions.
How do the CW44 and CW44k differ in terms of temperature range?
The CW44 is equipped with a thermostat for fresh water, covering a temperature range of -2 to +106 °C, while the CW44k features a brine thermostat with a range of -37 to +71 °C; the short-time maximum temperature differs accordingly.
What are the key features of the CW44 connections and materials?
The connections are threaded sockets (BSP 3/8, 1/2, 3/4 or 1"), the valve body is made of forged steel C 22.8 (DIN 1.0460), and the valve has a straight-through design suitable for installation in pipelines within the corresponding DN range.
What are the main applications and objectives of this valve?
It is used for temperature limitation and control in return water/cooling circuits, helping to use cooling water more efficiently, reduce water consumption, and deliver a rapid response to load changes and during startup.
What are the key points to consider when selecting a CW44?
Select the appropriate model (CW44-G3/8, CW44-G1/2, CW44-G3/4, CW44-G1) based on the actual pipe diameter DN and the threaded connection size at the installation site, and verify the required outlet temperature range and medium conditions.