INSTALLATION AND OPERATION MANUAL FOR TECJET 52 GAS REGULATI Caterpillar

General

Build-up of deposits near the metering area of the TecJet^TM 52 can develope depending on the quality of the gas being metered. This build-up can affect the performance of the TecJet 52 and may appear as degradation of actual flow vs command flow accuracy, or as flow control instability.

Limits of Applicability

Periodic cleaning may be performed and needed to ensure the best operation of the TecJet 52. It is the customer's responsibility to monitor the need for valid scheduled maintenance, as this will vary depending on the quality of the gas in the particular application.

The procedure below has been tested and validated for a particular gas environment (mineral deposits); the applicability to other gaseous environment needs to be validated by the OEM at the customer site.

Cleaning Procedure

When cleaning the metering element and the inside of the valve body, do not use sharp objects that may scrape or dent the metering elements, as this could degrade the accuracy of the valve. Any damage to the internal geometry of the TecJet 52, especially the valve plate or bore area around the valve plate, will change the calibration of the valve and void the warranty. High pressure washing is not recommended. There are no components of the TecJet 52 that are replaceable or serviceable. Make sure that the power is disconnected before removing the TecJet 52 main connector.

A petrochemical solvent is recommended to clean (wash and brush) the valve when mineral film/patina build up is observed.

In applications where solids (mineral deposits) are found in the gas, the following procedure should be used (this procedure can be performed at the site):

* Position the TecJet 52 in the fully open position.

* Place a plugged piece of tubing over the P1 probe to completely seal the probe.

* Place a plug in the P2 port to completely seal it.

* Cap/seal the inlet flange of the TecJet 52.

* Fill the TecJet 52 with a solution of 60° C water and 2 tablespoons of Dawn (or equivalent) dishwashing liquid.

* Cap/seal the outlet flange of the TecJet 52.

* Leave soap solution in the TecJet 52 for 24 to 30 hours.

* Remove the cap/seal on the outlet flange of the TecJet 52.

* Dump the soap solution out of the TecJet 52.

* Fill the TecJet 52 with fresh 60° C water and move the water around in the valve bore with a long plastic rod or equivalent.

* Dump and rinse water out of the TecJet 52.

* Fill the TecJet 52 again with fresh 60° C tap water and move the water around in the valve bore with a long plastic rod or equivalent.

* Dump and rinse water out of the TecJet 52.

* Remove the cap/seal on the inlet flange of the TecJet 52.

* Inspect the valve plate and bore area around the valve plate for any remaining contamination.

* Use a soft plastic brush, or equivalent, to gently remove any remaining contamination and rinse with tap water as necessary.

* Remove the tubing from the P1 probe.

* Remove the plug from the P2 port.

* Leave the valve bore open until completely dry.

* If contamination has been successfully removed, return the valve to service.

* If contamination still exists on the valve plate and/or bore area around the valve plate, the unit will need to be replaced with a new unit.