Pilot operated valves

Valves of this type require a pressure difference of the operating pressure to open and close.

Series	Design	Inter thread Seat diameter	Flange	Pressure range	Housing material	Medium temperature	Downloads
40	2/2-way valve with diaphragm seal	G1/4-G3 13.5-80 mm	--	0.3-20 bar	Brass 2.0402 Stainless steel 1.4581	-10 °C/ +80 °C
28	2/2-way valve with diaphragm seal	--	DN15-DN50	0.3-20 bar	Brass 2.0402 Stainless steel 1.4581	-10 °C/ +80 °C
51	2/2-way valve with piston seal	G1/4-G2 13.5-50 mm	--	0.5-40 bar	Brass 2.0402 Stainless steel 1.4581	-20 °C/ +80 °C
54	2/2-way valve with piston seal	--	DN15-DN50	0.5-40 bar	Cast iron EN-GJL-250 Cast steel GP240 GH Stainless steel 1.4581	-20 °C/ +80 °C
25	2/2-way valve with piston seal	--	DN65-DN250	1-40 bar	Cast steel GP240 GH	-30 °C/ +80 °