Snowbirdxx
Well-Known Member
The NMP valve is an abbreviation of No More PeeValve. The husky, having a fuel system with always interconnected tanks, allows crossflow if the airplane is parked on a slope or flown one wing low.
The tank vent lines have a checkvalve installed, but that does not necessarily close immediatly, if there is little flow. This is to allow fuel-expansion. But it makes the dog pee on ramps and on climbouts.
The NMP valve is a checkvalve that slides on the end of the fuelventline.
It will open for fuel expansion at 0.2 barpressure. Plusitshouldonly be used on one wing,if the capsare unvented.
Used on the left wing, it keeps, at full tanks, the fuelin the tanks and does not allow over-flowing. Plus it protects the fuelventlinesfrom getting clogged by insects.
Same when parked on slopes.
I ll make new ones ( Version 3.0 ) upon request. Instead of a Duck valve it will have a valve from a carburetor manufacturer. This SSsteel / Viton valve costs about 5$. The rest is free.
Available from Snowbirdxx@aol.com
TomD
The tank vent lines have a checkvalve installed, but that does not necessarily close immediatly, if there is little flow. This is to allow fuel-expansion. But it makes the dog pee on ramps and on climbouts.
The NMP valve is a checkvalve that slides on the end of the fuelventline.
It will open for fuel expansion at 0.2 barpressure. Plusitshouldonly be used on one wing,if the capsare unvented.
Used on the left wing, it keeps, at full tanks, the fuelin the tanks and does not allow over-flowing. Plus it protects the fuelventlinesfrom getting clogged by insects.
Same when parked on slopes.
I ll make new ones ( Version 3.0 ) upon request. Instead of a Duck valve it will have a valve from a carburetor manufacturer. This SSsteel / Viton valve costs about 5$. The rest is free.
Available from Snowbirdxx@aol.com
TomD