Issued 10/08Bulletin No. Y07296

PILOTS

SPECIAL PRESSURE PILOTS

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APPLICATION: The Pilot may be coupled with a Single Acting Motor Valve from Catalog Section E2 to produce a Back Pressure Regulator with a remotely mounted Pilot.

FEATURES: Single Adjustment Filtered gas supply Accurate control Intermittent bleed construction Remote installation

SUPPLY PRESSURE: Controlled pressure is also the source of instrument gas

PRESSURE RANGE: 5 psig to 300 psig

OPERATION: The Pilot Assembly, which moves as a unit without friction within the housing, is supported by the PILOT DIAPHRAGM and the MODULATING DIAPHRAGM. The PILOT SPRING loads the upper side of the Pilot Assembly and is opposed on the underside by Controlled Pressure (Red) acting on the net area of the PILOT and MODULATING DIAPHRAGMS (area of PILOT DIAPHRAGM minus area of MODULATING DIAPHRAGM). The 12 PG SP Pilot can be considered as an inverse multi-plier. Each 1 psig change in Controlled Pressure (Red) results in a change in Output Pressure (Yellow) of 12 psig. The 30 PG SP Pilot changes at a ratio of 8:1. With a slight decrease in Controlled Pressure (Red) the Pilot Assembly is forced downward by the PILOT SPRING. The lower seat for the PILOT PLUG (Yellow to Atmosphere) is closed and the upper seat for the PILOT PLUG (Red to Yellow) is opened. This results in an increased Output Pressure (Yellow) under the MODULATING DIAPHRAGM which balances the lost upward force due to the slight decrease of Controlled Pressure (Red). The Pilot Assembly returns to a position at which both the upper and lower seats are closed. A slight increase in Controlled Pressure (Red) closes the upper seat and opens the lower seat to reduce the Output Pressure (Yellow).

The 12/30 PG SP Pilot is unique from other Kimray Pilots in that it uses gas from the sense line to operate the valve Designed for use as a Back Pressure Regulator, this combi-nation of a 12 or 30 PG SP Pilot and a Single Acting Motor Valve (from Catalog Section E2) limits upstream pressure by adjusting open to relieve excess pressure or conserves upstream pressure by adjusting closed to limit the flow to downstream. This is the primary application for the Pilot.

REMOTE PILOT INSTALLATIONFOR BACK PRESSURE CONTROL

Bulletin No. Y07296 Issued 10/08

PILOTS AND ACCESSORIES

SPECIAL PRESSURE PILOTSCAST IRON / DUCTILE / STEEL

THRU VALVES AVAILABLE: NOTES:

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CAT. MAX OPER. NO. PILOT W.P. PRES. KIT

AFM 12 PG SP 175 125 RBLAFR 30 PG SP-D 300 300 RBLAHR 30 PG SP-S 300 300 RBL

12 PG SPCAST IRON

30 PG SP-DDUCTILE

30 PG SP-SSTEEL

PILOTDIMENSIONS

All openings are tapped 1/4" NPT.

*These are recommended spare parts and are stocked as repair kits.