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3-Way Pressrestatic Shunt Valves

3-Way Pressrestatic Shunt Valves
3-Way Pressrestatic Shunt Valves
Product Code : 92
Product Description

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 110°C, secondary 70°C
  • Rated pressure PN primary 4.5 Kg/cm², secondary 10 Kg/cm²
  • 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.


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