D 7394 page 2
3. Additional data
Type Piston valve
Design Full steel design, piston hardened and ground, running surfaces polished
Hydraulic connection Type TV 3: ISO 228/1 (BSPP), suitable for threaded pipe fittings with shape B male fittings,
DIN 3852-2
Type TV 3 P: Manifold mounting
Installation position Any, Bleeding is necessary when installed in upright position (see below)
Flow direction from C to A and B
Pressure medium Hydraulic oil conforming DIN 51524 part 1 to 3: ISO VG 10 to 68 conform. DIN 51519
Viscosity range: Viscosity during start min. approx. 4; max. approx. 1500 mm
2
/s
opt. service: approx. 10 ... 500 mm
2
/s
Also suitable are biologically degradable pressure fluids type HEPG (Polyalkylenglykol) and type
HEES (Synth. Ester) at service temperatures up to approx. +70 °C.
Obey general insturctions in D 5488/1, sect. 2
Temperature Ambient: approx. -40 ... +80°C; Fluid: -25 ... +80°C; Take note of the viscosity ranges!
Start temperature down to -40°C are allowable (Pay attention to the viscosity range during start!), as
long as the operation temperature during subsequent running is at least 20K (Kelvin) higher. Biological
degradable pressure fluids: Pay attention to manufacturer's information. With regard to the compati-
bility with sealing materials do not exceed +70°C.
Q
A
orifice characteristic
for p
A
= p
B
Bleeding
The privilege oil flow Q
A
allocated to the orifice # is only to be regarded as a recommended value.
The most frequently required Q
A
ranges between approx. 2... 10 lpm can be recorded with the metering orifices available as stan-
dard. The only important thing is that the desired value has been determined when ordering and is quoted by the corresponding
orifice identification number. Later replacement of orifices would only be possible by heating the removed control piston to approx.
180°C with the aid of a hot-air gun, because a threaded ring fixing the orifices is secured with Loctite and this bonding only becomes
yielding over 150°C.
Orifices-# Order-Nr
1.6 7360 050 a
1.8 7360 050 e
2 7360 050 g
2.4 7360 050 h
2.5 7360 050 b
2.7 7360 050 d
3.2 7360 050 c
3.3 7360 050 f
Material St 1203m
DIN 1541
The above Q
A
characteristic (recommended value)
applies to equal pressure at outlets A and B. If the
pressures are different, the constant flow changes
slightly depending on the current pressure difference
P
A,B
= P
A
-P
B
corresponding to Q
A actual
= k · Q
A
.
Usually any air which entered the spring cavity during initial operation or
fluid service will be flushed out during subsequent operation. The spring
cavity has to be bled via the bleeder screw, in case the device is installed in
upright position (spring cavity in top position) or a whirring noise does occur.
Procedure: Run the system in unloaded state (reduce the system pressure if
possible). Loosen the bleeder (do not remove) until no more bubbles are
detected. Retighten the bleeder and reset the pressure limiting valve (use a
pressue gauge)!
Bleeder
ISO 4017-M 4x6-8.8-A2K
Seal ring A 4x8x1
DIN 7603-Cu
Spring cavity
Privilege oil flow Q
A
(lpm)
Orifice-# (mm)
(bar) (bar)
|p
A, B
= p
A
- p
B
p
A
< p
B
p
A
> p
B
Multiplication
factor k
Screw (part No. 7360 054)
secured with LOCTITE 241