Shut-Off, Control and Safety Valves
Data Center
Shut-off, control and safety valves decide where the water-glycol mixture goes inside a data centre, at what pressure it arrives and what happens when a circuit runs past its limit. This branch holds 11,754 items in seven groups: ball and gate valves for isolating individual risers, needle and balancing valves for hydraulic balancing, check valves against backflow from the header, safety relief valves as the last line of defence, pressure reducers for make-up duty, and solenoid and motorised valves for automation.
Connections run from G 1/8 to G 1 1/2, nominal sizes from DN 4 to DN 32. One material rule governs the IT circuit: stainless steels 1.4401, 1.4404, 1.4408 and 1.4571 together with PVDF, PP, PE, PTFE, POM and PVC can be used without restriction. Brass, gunmetal and bronze only where the whole circuit stays single-alloy. Galvanised steel and aluminium have no place in a glycol circuit. Brands stocked: Fluidics equipment, Riegler, Köly Deutschland, Wika, E.MC, Sang-A, Airtec and YPC.
Categories
Function, key figures and materials of each subgroup
| Group | Function in the circuit | Key figures in stock | Materials |
|---|---|---|---|
| Ball valves and shut-off valves | Isolate a riser, divert flow, shut off instruments | DN 15 to DN 32, G 1/8 to Rp/R 1 1/2 | Stainless 1.4408 CF8M, 1.4401, 1.4571, nickel-plated brass |
| Balancing and line regulating valves | Set the flow rate of each riser precisely | DN 4 and DN 8, Rp/R 1/4 to 1/2 | Brass, nickel-plated brass |
| Check valves | Prevent backflow from header and pump | PN 40, cracking pressure from 0.01 bar | Brass, stainless steel |
| Safety and pressure relief valves | Relieve the circuit above the permitted pressure | Set pressure 1.1 to 25 bar, DN 8 and DN 10 | Brass, nickel-plated brass, stainless 1.4401 |
| Pressure reducers and make-up valves | Cut inlet pressure, hold make-up pressure steady | 0.5 to 50 bar adjustment, G 1/4 to R 1 1/2 | Brass, stainless 1.4404, cast 1.4401 |
| Solenoid and motorised control valves | Open, close and divert circuits remotely | G 3/4 to G 1 1/2, 12 to 230 V, up to 16 bar | Brass, brass with actuator |
| Valve accessories | Operation, extension, locking | Range being built up | still open |
- Isolating single rack rows and CDU connections for service while the room stays online
- Hydraulic balancing of parallel cooling circuits with needle and balancing valves
- Backflow protection at pumps and in headers of redundant circuits
- Protecting closed circuits and expansion vessels against excess pressure
- Pressure maintenance and make-up through a reducer and a potable water inlet stage
- Remote changeover between free cooling and chiller with solenoid and motorised valves
- Fitting, testing and replacing gauges and pressure switches without draining the circuit
