Flow divider type TV 3

with privilege division

D 7394

Flow divider type TV 3

August 2008-01

HAWE HYDRAULIK SE

STREITFELDSTR. 25 • 81673 MÜNCHEN

2.4

Pression p

max

= 300 bar

Flow Q

max

= 60 lpm

Max. privileged flow Q

A max

= 8.8 lpm

1. General

2. Types available, main data

The valve devides the flow (Q

) entering at port C in two flows(Q

and

). The previliged flow (Q

) leaving at port A is kept constant and a

residual flow (Q

) leaving at port B. This residual flow can be calculated

as it is the difference Q

- Q

i.e. whenever Q

changes Q

will change

as well whereas Q

remains constant (as long as Q

The flow division is achieved by way of a spring-loaded piston which, in

its current control setting with ring grooves in the housing, displays a

throttle cross section which closes towards A and opens towards B

simultaneously. The control setting is determined by a metering orifice,

whose flow resistance will move the piston against the spring force. The

orifice bore determines the flow Q

The valve is only working properly when there is a flow at both ports A

and B. When there is no flow at one of the outlet ports, the valve will stop

the flow to the other one as well. But there will be always a minimum

leakage flow (depending on the pressure difference) via the the piston

/bore gap. Either a pressure limiting valve or a valve with idle circulation

mode (in case of directional valve control) has to be installed in the

respective consumer line to maintain proper function of the privilege flow

devider when one side (A or B) would show no flow otherwise.

Coding example:

TV 3 - 2,5

Table 1: Basic type, and size

Table 2: Available metering orifices

Design

Pipe

connection

TV 3

TV 3 P

Manifold

mounting

SymbolsCoding Flow Q

C max

(lpm)

Press.

max

(bar)

Connections

A B, C

Mass

(weight)

approx. (kg)

G 3/8 G 1/2

ISO 228/1

(BSPP)

For dimen-

sions, see

sect. 4

60 300 1.0

Section drawing of TV 3

Bleeder screw

Piston spring

Control

piston

Metering

orifice

Identific.

(= # mm)

1,6 1,8 2,0 2,4 2,5 2,7 3,2 3,3

2.7 3.2 4.1 5.4 5.8 6.9 8.8 10.2

see also coding sect. 3

Guide line Q

(lpm)

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

opt. service: approx. 10 ... 500 mm

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.

orifice characteristic

for p

= p

Bleeding

The privilege oil flow Q

allocated to the orifice # is only to be regarded as a recommended value.

The most frequently required Q

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

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

A,B

= P

-P

corresponding to Q

A actual

= k · Q

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

(lpm)

Orifice-# (mm)

(bar) (bar)

A, B

= p

- p

< p

> p

Multiplication

factor k

Screw (part No. 7360 054)

secured with LOCTITE 241