WITT is a supplier of high-quality pressure regulators / pressure reducers for the adjustment or pressure reduction of gases. Dome pressure regulators are a type of pressure regulator which is usually used in line installations. They are particularly suitable for fluctuating gas withdrawal rates and large flow rates with small pressure differences. WITT dome pressure regulators ensure maximum control, even when the inlet pressure drops down to 1 bar above the outlet pressure. Their constant outlet pressure ensures that the downstream processes can be controlled.
WITT dome pressure regulators can be used for inlet pressures up to 4351 psi (300 barg), and offer control ranges from 7,25 psi (500 mbarg) to 870 psi (60 barg).
The dome pressure regulators / pressure reducers are operated in combination with a pilot pressure regulator / control pressure regulator, or optionally with a proportional valve, which is used to set the desired working pressure. The gas to be regulated (own medium) or a different gas can be used as pilot gas / control gas.
WITT dome pressure regulators / pressure reducers are available individually or as a completely assembled set including control pressure regulator, gauges and connections. The sets are delivered fully assembled and tested – and are ready to use. The WITT dome pressure regulators / pressure reducers are particularly easy to install due to their compact design.
WITT dome pressure regulators at a glance
- for O2 from 435 psi (30 barg) and for N2, Ar, He, H2, CH4 from 580 psi (40 barg) down to 7.2–435 psi (0.5–30 barg), up to 529,720 scfh (15,000 Nm3/h) (N2), Kv values ranging from 2.4 to 30
- Our high pressure models LE-HD/S: O2, N2, Ar, He, H2, CH4 from 4,351 psi (300 barg) down to 7.2–870 psi (0.5–60 barg), up to 84,755 scfh (2,400 Nm3/h), Kv value 1.65
- CO2-specific versions are available (1,450 psi down to 7.2–377 psi /100 barg down to 0.5–26 barg)
- Standard gas temperature range -22°F to 122°F (-30°C to +50°C)
- Threaded and flanged connections from 3/4" up to 3" / DN100 – DIN or ANSI
- Customized versions are available, e.g. with proportional valves
Functionality of dome pressure regulators
Dome pressure regulators are operated by means of gas pressure. In contrast to spring-loaded pressure regulators or pressure reducers, the opening force of the valve required for pressure reduction is not generated by a spring, but by the pressure of a so-called pilot gas / control gas. In the WITT dome pressure regulator sets, the gas to be regulated is used as the pilot gas ("own medium control"). The pilot gas is fed via a built-in pilot gas regulator into the pressure chamber of the dome, where it meets a valve seat. Here it acts on a diaphragm whose stroke movement is transmitted to the valve seat via a diaphragm plate. The valve is thus opened or closed by the pressure of the pilot gas and the corresponding stroke movement of the diaphragm, depending on the set outlet pressure, and transmits the gas at the required pressure. Excess pilot gas is discharged into the outlet via an integrated gas pressure relief valve. WITT dome pressure regulator sets are thus closed systems and their set pressure can be adjusted when desired, even during operation.
Typical applications of dome pressure regulators
In principle, dome pressure regulators are suitable for any application in which a given gas pressure is to be regulated or reduced or reduced to a working pressure suitable for the application.
Because of their unmatched pressure control accuracy, WITT dome pressure regulators are ideally suited to all applications requiring stable outlet pressures.
These include :
- at cryogenic tank vaporiser outlets
- for CO2 systems for welding gases
- in industrial high-pressure gas supply, e.g. from compressed gas transporters, cylinder bundles and buffer tanks
- installed in compressors and turbines to regulate seal-gases.