Question about Ingersoll Rand Stationary Air Cooled Rotary Screw Compressor 10 Hp, 35 Cfm At 125 Psi, Model# Ep
You have a minimum pressure check valve (MPRV) leaking by. Depending on year model the mprv may be back in the cabinet. However based on previous experience i think your mprv is located near the separator tank top. Their should be an elbow out of the top of the separator tank,a short line then the mprv.It will probably have an aluminum cap. Some models you will have to replace the entire valve while others will have a repair kit available.If it has an aluminum cap, disconnect from power supply,bleed off all air pressure and remove the cap from the mprv. Their will be a spring,a piston with an o-ring on it, a small spring,a stem with a teflon seat. After removing the cap remove the large spring and if necessary use needle nose pliers to pull the piston out. This may prove to be be difficult because the piston may be stuck due to rust,dirt,rolled o-ring or all of it. I have had to remove the mprv and knock out the piston. if this is the case stop and just replace the whole mprv. If it comes out easily make sure you remove the small spring,stem with teflon seat next. Inspect the teflon seat for cuts tears etc. If good clean everything up especially the piston. Make sure not to damage the o-ring on the piston as they are hard to find unless you purchase a rebuild kit from IR.Next use a small cylinder hone and clean the bore where the piston travels. After all items are cleaned honed etc lube everything up with sil-glide. Assemble the mprv. your problem should be gone. Note: sometimes cleaning and lubricating is not enough and the mprv will need to be replaced
Posted on Mar 15, 2011
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Posted on Jan 02, 2017
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