4/3, and 4/2 directional valve with mechanical, manual operation, type WMM16, 25 and 32

Function and configurationsThe type WMM valves are hand lever operation directional spool valves. They control the start, stop and direction of a flow.The directional valves basically comprise of a ho...

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Product Detail

Function and configurations

The type WMM valves are hand lever operation directional spool valves. They control the start, stop and direction of a flow.

The directional valves basically comprise of a housing (1), hand lever (2), control spool (3), as well as one or two return springs (4).

In the unoperated condition the control spool (3) is held in the neutral or its initial position by the return springs (4). The control spool (3) is actuated by the hand lever (2) via a joint and a pin. The spool is thereby moved out of its initial position into switched position.

After the hand lever(2) has been returned to the zero switched position , the spool (3) is returned to the neutral position via the return springs (4).

4WMM.../F... (With the detent)

The directional valves with one detect , 2 or 3 switched position , can be orientated at any switched position.

Ordering code

Technical data

Nominal size	16	25	32
Weight kg	Approx.8	Approx.12.2	Approx.49
Actuation force-with spring retrn N	Approx.75	Approx.105	Approx.170
-with detent N	Approx.75	Approx.105	Approx.170
Actuation angle about the neutral postion 。	2x26°	2x32°	2x30°
Max.operating pressure port A,B,P bar	315
Port T bar	250
Fluid	Mineral oil suitable for NBR and FKM seal
Fluid	Phosphate ester for FKM seal
Fluid temperature range ℃	-30 to +80 (NBR seal)
Fluid temperature range ℃	-20 to +80 (FKM seal)
Viscosity range m㎡/s	2.8 to 380
Degree of contamination	Maximum permissible degree of fluid contamination: Class 9.NAS 1638 or 20/18/15, ISO4406

Symbols

Three-position can derive two-position(*A/*B)

Return spring and with detent

Notes:

For size 16, the port L should be used as drain port (X, Y are not used),

while for size 25 and 32, the port Y is used as drain port (X, L are not used).

Characteristic curves (Measured at θₒᵢₗ=40℃±5℃, using HL oil)

The switching performance of the valves depends on the filtration. To achieve the specified admissible flow values, we recommend full flow filtration with 25 μm. The flow forces acting within the valves also affect the flow performance. With 4 way valves the specified flow data thus apply to normal operation with 2 volume flow directions (e.g. from P to A and at the same time return flow from B to T) (see table).

If only one flow direction is available, in certain cases, the admissible flow can be significantly smaller (e.g. when using a 4 way valve as 3 way valve, due to blocked connection A or B).

Nominal size 16

Allowing flow qv L/min, 2-position valve						Allowing flow qv L/min, 3-position valve
Symbol	Operating pressure P bar					Symbol	Operating pressure P bar
Symbol	70	140	210	280	315	Symbol	70	140	210	280	315
Return spring						Return spring
C	300	300	300	260	220	E,H,J,L,M,Q,R,U,W	300	300	300	300	300
D	300	300	210	190	160	F,P	300	300	210	190	170
K	300	300	200	150	130	G,S,T	300	300	220	210	180
Z	300	240	190	170	150	V	300	260	200	180	170
With detent						With detent
C,D,K,Z	300	300	300	300	300	E,H,J,L,M,Q,R,U,W	300	300	300	300	300
						F,P	300	300	280	230	230
						G,S,T	300	300	230	230	230
						V	300	300	250	230	230

Nominal size 25

Allowing flow qv L/min, 2-position valve							Allowing flow qv L/min, 3-position valve
Symbol		Operating pressure P bar					Symbol	Operating pressure P bar
Symbol		70	140	210	280	315	Symbol	70	140	210	280	315
Return spring							Return spring
C	450		300	250	200	180	E,J,L,M,Q,R,U,W	450	450	450	450	450
D	350		300	275	250	200	F	450	250	200	135	110
K	200		150	140	130	120	G,T	450	330	290	230	180
Z	300		270	240	220	200	H	450	450	400	400	350
							P	450	310	240	215	150
							V	450	310	280	270	200
With detent							With detent
C,D,K,Z	450		450	450	450	450	E,F,G,H,J,L,M, P,Q,R,T,U,W	450	450	450	450	450
							V	450	450	400	350	300

Nominal size 32

2-position and 3-position valves with spring return
Flow L/min Spool symbol	When...(bar)
Flow L/min Spool symbol	70	140	210	280	315
E,J,L,M,Q, R,V,U,W	1100	1050	860	750	680
F,G,H,S,T,C,D,K,Z	650	450	370	320	280
2-position and 3	-position valves wi	th detent
All symbols	1100	1050	860	750	680

Unit dimensions: nominal size 16

Unit dimensions: nominal size 25

Unit dimensions: nominal size 32