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2.2.3 Pressure relief valves up to 460 l/h
Pressure relief valves up to 460 l/h are designed as three-way
valves. They have an inlet and an outlet on opposed sides, and
an unpressurised overflow outlet. The flow direction is indicated
by an arrow on the valve body.
The pressure relief valves can be installed in the outlet line, or
mounted directly on the outlet valve of the dosing pump with an
optional adapter, see section
7.1 Union nut adapters (up to 460
l/h).
Installing the valve in the outlet line
Observe section
2.2.1 Installation
Install the valve in flow direction. The flow direction is
indicated by an arrow on the valve body.
1. Install the valve in the outlet line.
2. Connect the overflow line to the overflow outlet, and direct the
unpressurised liquid to the tank or a suitable overflow.
3. Re-tighten the screws on the top part of the valve after 48
operating hours with a torque wrench. Max. torque:
Up to 60 l/h
60-460 l/h
2 Nm
4 Nm
Installing the valve directly on the pump
Valves up to 460 l/h can be installed directly on the pump with a
special adapter. See section
7.1 Union nut adapters (up to 460
l/h).
1. Remove the connector from the inlet of the valve.
2. Screw the adapter onto the inlet of the valve.
3. Screw the valve with the adapter onto the outlet valve of the
pump.
4. Connect the outlet line to the outlet of the valve.
5. Connect the overflow line to the overflow outlet, and direct the
unpressurised liquid to the tank or a suitable overflow.
6. Re-tighten the screws on the top part of the valve after 48
operating hours with a torque wrench. Max. torque:
Up to 60 l/h
60-460 l/h
2 Nm
4 Nm
2.2.4 Pressure relief valves DN 32 to DN 65
Pressure relief valves DN 32 to DN 65 are usually designed as
bypass pressure relief valves with connected T-piece for
installation in the outlet line.
The relief pressure of the valve depends on the direction of
installation, i.e. the direction the liquid flows through the valve
(see fig. 2). The T-pieces are pre-assembled according to the
selected relief pressure. See section
Flow direction
Öffnungsdruck
Opening pressure
Pression de service
Fig. 2
Indication of relief pressure on valve body
4
requirements.
DN 32, DN 50, DN 65
5 Nm
DN 32, DN 50, DN 65
5 Nm
9. Technical
data.
The T-piece is not always supplied as standard.
There are some special versions in the form of
three-way valves similar to the valves up to 60 l/h.
Please always observe the corresponding
dimensional drawings in section
For three-way valves proceed as described in
section
2.2.3 Pressure relief valves up to 460
Installing the valve
1. Install the T-piece with the valve in the outlet line.
2. Connect the overflow line to the pressure relief valve and
direct the unpressurised liquid to the tank or a suitable
overflow.
3. Commissioning the product
The product must only be adjusted and
commissioned by authorised and qualified persons.
When working with chemicals, the accident
prevention regulations applicable at the installation
site must be applied.
Observe the chemical manufacturer's safety data
sheets when handling chemicals.
When working on the product or connections and
lines, always wear protective clothing (e.g. safety
goggles and gloves). The system must be
pressureless.
Wipe up spilled liquid immediately to avoid slipping
hazard.
The relief pressure of the valve is set in the factory to the value
specified in the technical data. See section
During operation, the relief pressure depends on various factors,
e.g. the flow, the stroke frequency of the pump, or the
counterpressure. If a more precise setting is required, the valve
must be adapted to the local conditions.
3.1 Setting the relief pressure
If the dosing pump does not provide counterpressure
measurement, a pressure gauge must be installed in the system
between the pump and the pressure relief valve.
WARNING
Pressurised dosing medium
Death or serious personal injury
- Set the relief pressure lower than the maximum
permissible operating pressure of the dosing
system.
A
Fig. 3
Setting the relief pressure
9. Technical
data!
l/h.
9. Technical
data.
B
C
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