Shut-Off, Control and Safety Valves
Pressure Reducers and Make-Up Valves
A pressure reducing valve cuts a high inlet pressure down to a constant outlet pressure and holds it, even when the inlet fluctuates or the draw-off changes. In a data centre it sits in the make-up line that tops up a closed cooling circuit with water or water-glycol, and upstream of components with a limited pressure rating. The group holds 991 items: water regulators with a built-in gauge, versions in brass and in stainless 1.4404, cast stainless regulators in 1.4401, the DRV 200 series and potable water reducers from Riegler and Resideo Braukmann.
Two distinctions drive the choice. Relieving regulators bleed off an outlet pressure that has climbed too high; non-relieving versions, marked NB in the type code, do not and need separate relief. The adjustment range has to match the circuit: stock covers 0.5 to 8, 1 to 15, 0.5 to 15, 1.5 to 12 and 3 to 50 bar, with connections from G 1/4 to R 1 1/2 and in NPT. For feeding from the public water main there are DVGW-approved versions.
- 690 items
- 3 manufacturers
- Net prices plus VAT
Buying guide
How to choose Pressure Reducers and Make-Up Valves
What matters when choosing: properties, comparison and typical applications.
How to choose a pressure reducer
Regulator types compared
Material, range and behaviour under excess pressure
| Criterion | Brass regulator (R series) | Stainless regulator 1.4404 | Cast stainless size 1 | Potable water reducer |
|---|---|---|---|---|
| Range in stock | 1 to 15 bar, 3 to 50 bar for CO2 | 0.5 to 8 bar, 1.0 to 17 bar | 1.7 to 17.5 bar | 0.5 to 2 bar, 1.5 to 12 bar |
| Connections | G 1/4 to G 1, NPT 1 1/2 | G 1/4 | G 1/4 | R 3/4 to R 1 1/2 |
| Relief behaviour | standard and NB version | both versions available | per version | per version |
| Fit for water-glycol | single-alloy only | unrestricted | unrestricted | inlet stage of the make-up line |
| Note | types rated for CO2 as well | non-relieving NB version | cast body, compact | DVGW-approved versions |
Typical applications
- Topping up closed cooling circuits from the water main at a constant fill pressure
- Pressure maintenance upstream of expansion vessels and pressurisation units
- Protecting heat exchangers and cold plates with a limited pressure rating
- Constant inlet pressure for dosing and treatment equipment on the cooling water
- Reducing main pressure at fill and flush connections during commissioning
- Supplying pneumatic actuators in the cooling periphery with a steady control pressure