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Publication Title | 3-Way Valve Orientation on Air Assist Circuit

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Telephone: (818) 734-5300 • Facsimile: (818) 734-5320 • Website:

Service Bulletin SB0048

Date: From: Subject:

December 2002

Capstone Technical Support

3-Way Valve Orientation on Air Assist Circuit

Systems Affected

All Model C30 HEV liquid fuel MicroTurbine engines shipped between 09/17/02 thru 09/20/02 (System S/N 2633, 2637-2641, and 2644-2648).

Description of Problem

The air-assist circuit on the HEV liquid fuel version of the 30-kilowatt Microturbine may have been shipped with the 3-way valve installed incorrectly at the factory. If installed in the wrong orientation, the engine will not idle correctly and fuel injectors are more susceptible to clogging. All users of this version of the Microturbine need to inspect and correct this issue if the valve is installed incorrectly.

The 3-way valve can be installed in two different orientations. Visually examine and verify that the number two (2) stamped on the valve housing is facing the air assist manifold as shown in the picture. If the 3-way valve is installed incorrectly, the valve must be removed and correctly repositioned.

The diagram below shows the correct orientation of the 3-way valve.

3-Way Valve


Air Manifold Block

Tee Fitting

NOTE: Make sure Port #2 on 3-way valve faces the Air Manifold Block

450013-001 Rev A (December 2002) Page 1 of 2


This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.

Image | 3-Way Valve Orientation on Air Assist Circuit

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