RTG 421


Pilot operated pressure regulator

RTG 421

Pilot operated pressure regulator RTG 421

RTG 421 regulators are of indirect action type and are used for reducing and regulating the pressure of non-corrosive gases (natural gases, LPG, etc.). The regulators ensure constant maintenance of outlet pressure within the limits of the regulation class, irrespective of the fluctuations of inlet pressure and flow rate. They are designed for natural gas transportation and distribution networks. RTG 421 regulators can be used for all installations with rapid variations of the flow rate. The highly special performance of the pilot system ensures pressure accurate regulation and regulator rapid response.

Reference standards: EN 334 and EN 14382
CE Certificate according to PED 97/23/EC

MODEL RTG 421 • RTG 421 SB • RTG 421 M
TECHNICAL CHARACTERISTICS Maximum allowable pressure: 16/20 bar
Inlet pressure range: 0,3 ÷ 30 bar
Outlet pressure range: 0,2 ÷ 12 bar
Minimum working differential pressure: 0,3 bar
Accuracy class (AC): ±1 ÷ 5%
Lock-up pressure class (SG): 2,5 ÷ 10%
Intervention accuracy class (AG):
- minimum up to 2,5%
- maximum up to 1%
(depending on the control pressure)
Normally open (RTG 421 FTO)
Incorporated shut-off device (RTG 421 SB)
CONNECTION TYPE Flanges: PN 16 ÷ PN 20/ANSI Class 150
Nominal diameter: DN 25 ÷ DN 400
OPTIONAL ACCESSORIES Incorporated silencer (AM)
Pilot electric gas preheater (WE)
OPERATING  CONDITIONS Ambient temperature: -30°C ÷ +80°C
Working fluid temperature: -20°C ÷ +60°C
WORKING MEDIUM Natural gas and other non-corrosive gases

Pilot operated pressure regulator RTG 421

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