The Stelflow 22mm unvented inlet control valve is a crucial hydraulic component designed to safely regulate incoming mains pressure for RM hot water cylinders. Operating as a sophisticated multibloc unit, it consolidates multiple safety and control mechanisms into a single, highly efficient brass forging. This integrated design significantly reduces the number of individual pipe connections required, thereby lowering installation time and minimising the potential for joint leaks in complex unvented storage setups.

The valve continuously manages system dynamics by incorporating a precise 3 bar pressure reducing valve, ensuring the cylinder receives a stable and safe flow of water regardless of fluctuating mains pressure. Additionally, it features a robust 6 bar pressure relief valve capable of discharging at 110 degrees Celsius, providing essential protection against over-pressurisation and thermal expansion. Complete with standard 22mm copper-to-copper compression fittings, this unit is fully compatible with both direct and indirect unvented cylinder models.

Q: What is the factory set pressure for the reducing valve?
A: The integrated pressure reducing mechanism is specifically calibrated to restrict incoming flow to a stable 3 bar.

Q: At what threshold does the relief valve activate?
A: The safety relief component is designed to discharge safely if the internal pressure reaches 6 bar.

Q: Is this valve suitable for all RM unvented cylinder types?
A: Yes, it is fully compatible for installation alongside both direct and indirect RM hot water cylinder models.

Q: What type of connections does the valve utilise?
A: It features standard 22mm copper-to-copper compression connections for rapid integration into existing pipework.