Pressure Tech LF-301 SERIES - 3 Operation; 4 Special Conditions for Safe Use; 5 Hazardous Location Usage; 6 Servicing and Maintenance

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3. Operation
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 whist venting downstream of the regulator.
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 LF-301 series are non-venting type regulators, therefore the outlet pressure shall be
reduced by venting downstream of the regulator whilst simultaneously turning the adjusting
mechanism anti-clockwise.
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 LF-301 regulators should only be performed after
fully reading and understanding the Operating and Servicing Manual. Due to the typical
nature of the gases the regulator can be used with, the operator should not endanger
himself/herself or others by working on this regulator without prior knowledge on the
Health and Safety concerns relating to handling of technical gases. Any uncertainty should
be clarified with Pressure Tech before working on the regulator.
Pressure Tech Ltd recommends the use of Krytox GPL 205 during servicing.
Prior to commencing service, please ensure that:
- The equipment has been de-pressurised
- The load spring has been de-compressed by turning the adjusting mechanism fully
anti-clockwise
- Applications involving toxic, flammable or corrosive media have been fully purged