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What does the RCV valve do ?

Posted: Fri Mar 22, 2019 4:43 am
by Tom68
and how is it plumbed ?

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Re: What does the RCV valve do ?

Posted: Fri Mar 22, 2019 4:57 am
by storm
The regulator control valve (RCV) is mounted on the regulator cover. The RCV is a one way check valve that opens at 8-10“ of water column and permits quick response of the secondary diaphragm during wide open throttle operation.
1994-1998 Medium Duty LPG Service Manual Supplement http://www.qtww.com/wp-content/uploads/ ... lement.pdf

Re: What does the RCV valve do ?

Posted: Fri Mar 22, 2019 5:01 pm
by C3H8
Add to that. It is only used with fuel control systems that use vacuum to control the secondary diaphragm. The standard orifice bleed hole in the fuel control fitting was not large enough to allow rapid response of the secondary diaphragm. The regulator control valve would open if the throttle was floored letting the secondary react quickly. It was spring loaded and the spring pressure was adjustable for different engine sizes to adjust the response. It made sure lean backfires could not occur at WOT.

Re: What does the RCV valve do ?

Posted: Fri Mar 22, 2019 5:20 pm
by Tom68
C3H8 wrote:
Fri Mar 22, 2019 5:01 pm
Add to that. It is only used with fuel control systems that use vacuum to control the secondary diaphragm. The standard orifice bleed hole in the fuel control fitting was not large enough to allow rapid response of the secondary diaphragm. The regulator control valve would open if the throttle was floored letting the secondary react quickly. It was spring loaded and the spring pressure was adjustable for different engine sizes to adjust the response. It made sure lean backfires could not occur at WOT.
You answered my next question before I asked it. 8)