Bellow point of use - S21

S21 point of use is designed for specialty gas applications. It is based on the S20 pressure regulator technology.

Key advantages

Bellow technology permits a large range of accurate outlet pressures in a compact design
Flexible mounting options on wall or panel
Must be installed with a flash back arrestor for use with acetylene
Acetylene version available (AD)

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Specifications

Female ports	G 3/8 (inlet/outlet) or 1/4 NPT (inlet/outlet)
Seat seal	EPDM
O-ring	EPDM - Standard / FPM
Diaphragm (valve)	Hastelloy®
Bellow	Bronze (Brass version) / AISI 316L (SS version)
Weight	± 0,9 kg
Leak rate	10-8 M bar l/s
Temperature range	-20 to +60 °c
Gauges	Low pressure (M10 x 1 or 1/4 NPT)
Inlet pressure	50 bar, AD: 20 bar
Outlet Pressure	1/3/10 bar, AD: 1,5 bar
Nominal flow	2/2,5/3,5 Nm3 /h (N2 ), AD: 1 Nm3 /h
Oxygen use	inlet pressure ≤ 30 bar max. for brass and stainless steel

Dimensional drawings

Product Configurator

	Body material		Outlet Pressure	End connections	O-ring material	Gauges	Plate
S	L	S21	1	G	EPDM	0	STD
	Chrome plated brass L Stainless steel I		1 bar 1 3 bar 3 10 bar 10 Acetylene version 1,5 bar AD	G 3/8 - G 3/8 G 1/4 NPT- 1/4 NPT N	EPDM - standard EPDM FPM FPM	Without 0 With 1	Without plate STD With metal plate M

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