3-Way Pressrestatic Shunt Valves

About 3-Way Pressrestatic Shunt Valves

3-Way Pressrestatic Shunt Valves for Domestic Boilers Series VDP

MAIN CHARACTERISTICS AND OPERATION : VDP valves are use in domestic boilers with heat exchangers for instantaneous domestic hot water production. When the user requests domestic hot water, the VDP valve shunts the flow of water from the primary circuit of the boiler towards the instantaneous heat exchanger (boiler) excluding the heating circuit; this shunted flow is modulated depending on the domestic hot water flow rate until it reaches the rate where the microswitch trips. The VDP valve is equipped with auxiliary microswitches and with an eventual flow rate regulator (reducer). There is a version that besides the above mentioned characteristics is able to modulate the domestic water flow rate in a wide entrance pressure range thanks to a by-pass (VDP/M series). All versions are also available with secondary heat exchanger (see fig.3). In this case they are called secondary groups. HYDRAULIC CHARACTERISTICS :

• Max temperature primary 110C, secondary 70C
• Rated pressure PN primary 4.5 Kg/cm, secondary 10 Kg/cm
• Max heat exchanger opening P 0.5 bar
• Max opening P for heating system path 0.3 bar
• Domestic water flow rate to activa te microswitches (1.4, 1.7 and 2.1) 0.3 l/min.
• Domestic water flow rate to relea se microswitches flow rate intervention -0.3 l/min.

Versatile Application & Durable Construction

Designed for rigorous environments, these 3-way shunt valves are ideal for HVAC systems, industrial processing, water purification, and chemical distribution. Options of stainless steel, brass, or cast iron provide robust mechanical strength, while various sealing materials enable compatibility with a wide range of media, including water, oil, and gas.


Flexible Installation & Reliable Operation

Mount the valves horizontally or vertically to suit your piping layout. Both flanged and threaded end connections are available, supporting international standards including ANSI, DIN, and JIS. Manual handwheel and gear-operated mechanisms grant precise flow control with equal percentage or linear flow characteristics, ensuring adaptability for your specific process needs.


Comprehensive Testing & Industry Compliance

Each valve undergoes 100% hydraulic and pneumatic testing to meet stringent Class VI leakage requirements. The body thickness is engineered as per standard design, delivering operational safety even under pressures of PN16, PN25, or PN40. Superior finishespolished or coatedbolster corrosion resistance and enhance longevity in demanding environments.