The valves are used for water or oil hydraulic control systems. They can also be used as pilot-control valves.
Type
Direct controlled ball seat valve
Connections
Plate mounting with O-ring seal on request available with
connection plate
Connection thread
NW3 = R1/4" or 1/4" NPT
NW6 = R3/8" or 3/8" NPT
Medium:
Compressed air and gases
Viscosity
1 to 300 cSt
Ambient temperature
Depends on control element, see table "Technical data of control elements", higher temperatures on request
Seals
NBR, other seal materials available upon request
Sealing
Ball on seat
Pressure range
0 to 100 bar for 3/2 dir.:
The pressure in connection "R" must not exceed 50% of working pressure
Switching time
Depends on operating pressure and operating temperature (see table: technical data of control elements)
Fitted position
Any
Flow direction
2/2W: From "P" to "A"
3/2W: From "P" to "A" or from "A" to "R"
The connections "P" , "A", and "R" must not be mixed up
Kv value
NW 6: 6,5 l/min.
NW 3: 1,2 l/min.
Materials
All parts coming into contact with the flow medium are made of
corrosion resistant materials
Operating modes
Electric, hydraulic, pneumatic, mechanical or manual operation
Special features
The valve is characterized by fast response times. The solenoid plunger of the electromagnet is dual-supported and thus protectedagainst wear. By means of a diaphragm seal between the pushrod and the solenoid plunger chamber the control electromagnet is protected against dirt and humidity. The arrestable manual operation device can be accessed by removing the type plate and is thus also protected against any accidental operation. The electric magnet and all other control elements can each be rotated through 90°. All wear parts are easily accessible and quick to replace.
(Valve is closed when magnet is de-energized)
Fig. 1 (electromagnet de-energized):
The pressure spring (2) presses the valve ball (4) via pushrod (3) into the valve seat (5). The pressure of the medium in infeed “P” supports the pressure spring action (2). Thus the passage from infeed “P” to working line “A”is blocked.
Fig. 2 (electromagnet energized):
When the electromagnet (1) is switched on, the solenoid plunger (6) presses the valve ball (4) - via lever (7) and pushrod (8), and against the force of the pressure spring (2) and the pressure of the medium in the infeed “P” - from its valve seat (5). Now the passage from infeed "P" to working line "A" is clear.
(Valve is open when magnet is de-energized)
Fig. 1 (electromagnet de-energized):
The pressure spring (2) lifts the valve ball (4) via pushrod (3) from the valve seat (5). Thus the passage from infeed "P" to working line "A" is clear.
Fig. 2 (electromagnet energized):
When the electromagnet (1) is switched on, the solenoid plunger (6) presses the valve ball (4) - via lever (7) and pushrod (8), and against the force of the pressure spring (2) and the pressure of the medium in the infeed "P" - into the valve seat (5). Now the passage from infeed "P" to working line “A” is blocked.
(Valve passage from "P" to "A" is closed when magnet is deenergized)
Fig. 1 (electromagnet de-energized):
The medium fed in via infeed "P" presses the valve ball (4) into the valve seat (5), supported by the pressure spring (2). Thus the passage from infeed "P" to working line "A" is blocked.
Fig. 2 (electromagnet energized):
When the electromagnet (1) is switched on, the solenoid plunger (8) presses the valve ball (6) - via lever (9) and pushrod (10), and against the force of the pressure spring (2) - into the valve seat (7). Now drain "R" is blocked. At the same time, using the spacer pin (3), the valve ball (4) is pressed out of the valve seat (5), so that the passage from infeed "P" to working line "A" is now clear.
(Valve passage from "P" to "A" is open when the magnet is deenergized)
Fig. 1 (electromagnet de-energized)
The pressure spring (2) lifts the valve ball (4) via pushrod (11) into valve seat (5). The medium flowing from infeed "P" to the working line supports the pressure spring action. Thus the drain "R" is blocked and the infeed "P" is connected to the working line "A".
Fig. 2 (electromagnet energized)
When the electromagnet (1) is switched on, the solenoid plunger (8) presses the valve ball (4) - via lever (9) and pushrod (10), and against the force of the pressure spring (2) and the pressure of the medium in the infeed "P" - into the valve seat (7). Now the infeed "P" is blocked and the working line "A" is connected to drain "R".
type dE4 (NW3) and dE3 (NW6), protection class acc.
to VDE 0170/0171
NW3: (Sch)d/(Ex)d2 G4 Besch.-Nr. T5681/BVS
NW6: (Sch)d/(Ex)d2 G5 Besch.-Nr. T5538/BVS
NW3/Pg 16 DIN 22419 available for voltages from 12 - 240 V
direct and alternating current.
power consumption
up to approx. 20 Watt
connection cable
12,5 - 14 mm (A15) NW6/Pg 21 DIN 22419 available for voltages
from 24 - 500 V direct and alternating current.
power consumption
up to approx. 32 Watt
connection cable
15 - 19 mm (A19)
