5
3. Operation
The SS-231 series of regulator are fitted with a stainless-steel Anti-tamper cap as standard. It
is recommended that for the pressure adjustment, the anti-tamper cap is removed, and a
13mm open ended spanner (or adjustable) is used to loosen the lock nut, a large flat headed
screwdriver is to be used to adjust and set the outlet pressure. Once correct set up is achieve
the lock nut should be reposition and engaged with bonnet to secure the set point.
(*Ref.
6.1.3)
Turning the adjusting mechanism clockwise compresses the spring, which in turn opens the
main valve and allows the inlet pressure to pass through the seat orifice until the outlet
pressure is equivalent to the loading forces set by the compressed spring. Increase the outlet
pressure in this way until the desired pressure is achieved.
To reduce the outlet pressure, the adjusting mechanism should be turned anti-clockwise
whilst the media is flowing, or whilst venting downstream of the regulator.
(*Ref. 6.1.3)
The desired outlet pressure should be set whilst increasing the pressure. Do not exceed the
maximum inlet and outlet pressures of the regulator which are indicated on the regulator
label.
4. Special Conditions for Safe Use
The SS-231 series are pressure regulators and should not be used as an isolation valve. When
adjusting Non-Venting (NV) option, the outlet pressure shall be reduced by venting
downstream of the regulator whilst simultaneously turning the adjusting mechanism anti-
clockwise.
(*Ref. 6.1.3)
5. Hazardous Location Usage
This equipment has not been manufactured specifically for use in potentially explosive
atmospheres and as such an ignition hazard assessment has not been carried out on this
product. If the user should wish to use this product in such an environment where there may
be a potentially explosive atmosphere then it is the responsibility of the user to conduct an
ignition hazard assessment against 99/92/EC.
6. Servicing and Maintenance
Servicing and maintenance work on the SS-231 regulators should only be performed after
fully reading and understanding the Operating and Servicing Manual. Due to the
compressibility of gases, the operator should not endanger themselves or others by working
on this regulator without prior knowledge of the Health and Safety risks relating to handling
of technical gases. Any uncertainty should be clarified with Pressure Tech before working on
the regulator.
