ZEW type valves

Solenoid valve ZEW

applied in installations in which the water (liquid) flow is two-positions controlled, eg:
– industrial and home water installations
– irrigation systems
– dosing and sanitary devices in the food industry, breweries, slaughterhouses
– automated public baths

Fluid media	Water, water solutions, non-aggressive liquids
Pressure	See tab „Dimensions / Pressures”
Fluid media temperature	max. +80°C
Ambient temperature	-10°C ÷ +60°C
Voltage	AC(50Hz) 12V, 24V, 110V, 230V; DC 12V, 24V
Power	AC 26VA, DC 26W
Closing time	< 1s
Operation type	Continuous (100%)
Degree of protection	IP54
Valve body material	Brass
Sealing material	ethylene propylene diene methylene rubber EPDM
Mounting position	coil upwards -acceptable deviation from vertical position up to 90O

Typ	Dn	Rp	A [mm]	B [mm]	E* [mm]	L [mm]	P_MAX [bar]	ΔP [bar]	Kv** [m³/h]	M [kg]
Threaded connection:
ZEW-20	20	3/4	128	18	54/37**	75	8	0,8/8	1,50	0,9
ZEW-25	25	1	138	19	54/50**	90	8	0,8/8	3,00	1,3
ZEW-40	40	1 1/2	162	33	68	120	8	0,8/8	5,00	2,1
ZEW-50	50	2	178	40	82	150	8	0,8/8	9,40	3,1

* – maxiumum width of valve
** – valve width without coil

valves utilize process pressure for operation
valves operate correctly only if there is a minimum differential pressure ΔPmin on the valve. In case it is smaller than required, valves of this type will not work properly.
differential pressure ΔP is needed to open the valve and keep it open,
the time of opening and closing the valve depends on the size of this difference
due to the small cross-sections of the control channels, they are sensitive to contamination (appropriate filters should be used upstream of them)
long actuation time (in some types even up to several seconds)
lower lifespan (on average – several hundred of thousand work cycles)