Operation

Under normal operating conditions, water passes through a virtually unobstructed DN25 or larger tee pipe, allowing this valve to be used in higher flow lines. The DN15 SPV will screw into any DN15 threaded opening with adequate internal clearance. When the water temperature rises above safe limits, and a danger of scalding exists, the thermal actuator located in the fl uid stream modulates the valve open. When the water temperature returns to the safe range, the valve then modulates closed, minimizing water loss. Due to the actuator’s placement in the fluid stream this valve is unaffected by ambient air temperature and is open at 41°C and will remain open until water temperature is 35°C.

Design Features

* Stainless body 
* Thermal element
* Narrow temperature band
* Compact, low mass - Fast response
* Ram-type plug for reliable tight shutoff 
* Sensitive to fl uid temperature only
* Unaff ected by pressure variations
* Easy installation with pipe wrench 
* Discharges the minimum amount of water required to keep water temperature within safe limits

Application

Solar radiation or overheating caused by steam or electric tracing can cause extremely high temperatures at the point of use, resulting in a safety hazard for plant personnel. When installed in safety showers, eyewash stations, and other locations exposed to the same source of overheating as the system, the SPV will be heated just as the pipe system. The valve will open to establish flow until the overtemperature water is eliminated and it will then modulate closed.

Specifications

Notes

* Seal material: EPDM, Viton available
* Valve body material: SS304/SS316 available.