[DeTomaso] electric heater valve - UPDATE INFO

[Tomas Gunnarsson]

Is this really a proportional valve, not an on-off type valve? Just asking
as it's available for among other voltages 110VAC operation.

Tomas

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of Larry Finch
Sent: den 24 mars 2011 19:19
To: detomaso at realbig.com; jtaphorn at kingwoodcable.com; oldwheel at shaw.ca
Subject: [DeTomaso] electric heater valve - UPDATE INFO




 All,

The OPEN/CLOSED plastic body 12 VDC valve I referenced yesterday had a
stated
maximum temp rating of 195 F. This caused us a bit of concern.

I have spoken with the seller, who is also the company owner. I gathered he
is an engineer,
and actually knows his wares rather than being just a vendor of items he
knows nothing about.
I learned this valve also has other shortcomings, but have in turn found
another valve offered
by this seller that is properly suited for our heater coolant shut-off
duties.

The plastic valve was only design-rated at 176F. The seller, like some of
us, reasoned
the valve's component materials were easily suited for a higher rating, and
he thus
listed the 195F rating. Soooo, the over-designed fudge factor has already
been taken.
Over time, the seller feels the elasticity properties of the diaphragm might
degrade and
diminish sealing properties. Additionally, that valve's opening motion is
dependent on the
pressure of the coolant. As our coolant system operates around 14-18 psi,
the pressure
is not enough to guarantee full opening.

This valve however should perform the task without any reservations:

http://tinyurl.com/high-temp-valve

It is $20 more, but is a brass housing with a Viton diaphragm; rated at
266F. In addition,
this valve is suitable for gravity feed uses, meaning the open position is
spring-assisted;
the low system pressure in our cars is not a concern.

The seller feels while this valve is a 1/2" size, it is better suited for
our 5/8" hoses than
a 3/4" size would be. It comes with 1/2" FNPT threads. The use of two
1/2"MNPT x 5/8" barbed fittings
would easily adapt it for our use.

Full specs are available by using the links in the auction.

Larry


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