Page 301 - Peter Paul 2019 Catalog

COIL OPTIONS
Diode Rectified Solenoid Valve Coils
for Quiet Operation
Most solenoid valves are powered by AC current, primarily because
AC voltages are readily available. AC solenoid has faster pull-in time
at a ratio as high as 3:1 compared to the DC power. AC or DC powered valves have a natural audible “click” at the beginning of each cycle and sometimes can emit a low but audible hum in operation.
Valves destined for quiet environments cannot accept the possibility of a hum or a buzz. In an AC valve, anything that will prevent proper mating of the plunger pole faces, including dust and dirt, cause noisy operation and because of the in-rush current and fast cycling, can cause higher heat rise than would be experienced.
All of these AC valves conditions have led us to provide many AC valves with diode rectified coils, allowing the valves to run on DC power for cooler and quieter operation in applications where these are required.
We offer the most basic solenoid valve with a diode rectified coil to meet specified user criteria and their use has not cause a significant cost increase where DC operation is necessary. For applications which require it, a 4-diode full wave bridge is available.
Peter Paul Water-Resistant Valves
for Submerged Operations
The Series 15 or 50 valves with encapsulated coil are for outdoor uses including boat trailers, HVACR, irrigation systems, off-road equipment, trucks, buses, trains or other vehicles experiencing exposure to wet environment. The valve feature a liquid epoxy spotted coil assembly and a rugged housing covered with a baked-on epoxy/polyester finish rated at 1000+ hours in a salt spray test. The potting provides increased heat transfer capabilities through elimination of trapped air pockets for a cooler running valve
All internal parts are constructed of stainless steel and brass and corrosion resistant parts are used for exposed parts. The standard version operates on 12VDC but dual power lead versions can be used for mounting on non- conductive surfaces. Additional power options are also available.
www.peterpaul.com >>> 1-860-229-4884 >>> 299