Peter Paul Excellence By Control

Series 40 Application

A solenoid-operated valve has been designed using Rynite® PET thermoplastic polyester resin and Delrin® acetal resin. The solenoid assembly is encapsulated with Rynite® PET thermoplastic polyester resin instead of epoxy. The coil bobbin is injection molded from Rynite® PET or, for valves installed in food or beverage equipment, from Delrin® acetal resin. The valve body, formerly machined in brass, stainless or aluminum, is now injection molded from Delrin®.

Peter Paul’s Series 40 valve serves in humidifiers, pneumatic factory automation systems, beverage dispensers and other equipment.

DuPont Engineering Polymers

Benefits Gained

Lower manufacturing costs. The switch from potted epoxy to Rynite® PET for encapsulation speeded production, avoided VOC emissions, eliminated secondary finishing and allowed integration of a mounting bracket in the design and elimination of a costly welded metal assembly for plunger guiding.

Durability. Peter Paul has tested valves for 20 million open-close cycles without failure.

Standards compliance. Peter Paul saved time and money in meeting UL 1446 Class F (155ºC) requirements by using a preapproved, pretested DuPont electrical insulation system (EIS).

Materials Chosen and Why

Solenoid encapsulation: Rynite® 415 HP. Bobbin: Rynite® FR530. Both meet needs fro strength, stiffness, high productivity in injection molding and UL1446 Class F listing.

Valve body and bobbin: Delrin®500 BK642. This material fulfills requirements for strenght, stiffness, and suitability for use in food and beverage equipment.