2/2 DIRECTIONAL CONTROL SEAT VALVE,
3/2 DIRECTIONAL CONTROL SEAT VALVE

NW3 AND NW6, FOR WATER, OIL AND AIR

  • Protection against accidental operation
  • Operating magnet protected against dirt and humidity
  • Operating elements can each be rotated through 90°
  • Wear parts are easily accessible and can be replaced quickly

The valves are used for water or oil hydraulic control systems. They can also be used as pilot-control valves.

Type
Directional control 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
Water, oil or air must be specially mentioned when ordering 

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 320 bar (630 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

Flow rate for liquids
Max. 20l/min at NW6
Max. 5l/min at NW3

Operating modes
Electric, hydraulic, pneumatic, mechanical or manual operation

Materials
All parts coming into contact with the flow medium are made of corrosion resistant materials

Special features

The valve is characterized by fast response times. The solenoid plunger of the electromagnet is dual-supported and thus protected against 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 de-energized)

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 de-energized)

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".

 


Valve body with console

Hydraulic and pneumatic operation

Mechanical operation

Manual operation


type dE4 (NW3) and dE3 (NW6), protection class acc.to VDE 0170/0171

NW3
(Sch)d/(Ex)d2 G4 certificate No.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 
112,5 - 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)