Pressure; Heating; Safety Relief Valve - Relative Adjustment - Johnson Pump TG GS2-25 Instruction Manual

3.17.1 Pressure

Safety relief valves are divided into 3 working pressure classes i.e. 4, 6 and 10 indicating the
maximum working pressure for that valve. Each class has a standard set pressure at 1 bar above the
indicated maximum working pressure. The set pressure can be set lower on request never higher.
Working pressure class
Standard set pressure (bar)
Working pressure range (bar)
Set pressure range (bar)

3.17.2 Heating

The weld on spring casing is provided with 2 thread connections. Flange connections are not
available.
Maximum temperature:
Maximum pressure:
3.17.3 Safety relief valve – Relative adjustment
Adjustment of the standard setting pressure is performed at the factory.
Note! When testing the safety relief valve mounted on the pump, make sure the pressure never
exceeds the set pressure of the valve + 2 bar.
To adjust the standard opening pressure, proceed as follows:
1. Loosen the tap bolts (7310).
2. Remove cover (7050).
3. Take the measurement of dimensions of H.
4. Read spring ratio in the below table and determine the distance over which the
adjusting bolt (7320) must be loosened or tightened.
Vertical safety relief valve
24
4 6 10
5 7 11
1 – 4 3 – 6 5 – 10
2 – 5 4 – 7 6 – 11
200°C
10 bar
7050
7320
7310
Set pressure modification
H
A.0500.501 – IM-TGGS/05.01 EN (03/2013)