3-Way and 2-Way Solenoid Valves for Quiet (No-Click) Operation

Peter Paul Electronics Co., Inc. has developed solenoid valves for use in medical applications such as hospital beds, breathing apparatus, and inflatable mattresses for burn patients in which a bumper is installed for quiet operation.

In normal industrial applications, the click of a solenoid valve is not an issue, but in the quiet of a hospital environment it can be nerve wracking to hear constant clicking as the valve is actuated. Several new plunger and bumper designs used in the 3-way function have a top seal but eliminate the metal-to-metal contact.

One way to “eliminate the click” is to put in a rigid top seal that’s non compensating and doesn’t move. The top seal contacts the end stop, but no metal contact is made. It requires a unique plunger and uses a special end stop to accommodate it. Many times the pressure ratings are reduced just a bit due to the increased air gap in the valve, affecting magnetic performance. Usually these applications are low-pressure air or vacuum, therefore the reduced rating of the valve is generally not an issue.

Rectified coils are also often specified in medical equipment, either full bridge or half bridge, to eliminate the potential for noise. Avalve, which might potentially cause a hum or buzz can be very annoying to a patient, so a full wave rectified unit for AC service is often preferred. A DC unit, not requiring a rectifier, is sometimes used in specific applications.

Also common is a bumper in a 2-way valve, usually just a flat disk with no sealing action. Bumpers may be urethane or filled Teflon or special low cold-flow Teflon, which doesn’t become deformed like virgin Teflon.

Occasionally, a bumper is included in a valve for a non-medical application where long life is critical. With a bit more cost, a Teflon coated plunger combined with a bumper will provide very long, quiet valve life under many operating conditions.

High Flow Valve

For LP and Natural Gas Applications

The Series 30 Normally Closed Valves for LP and natural gas has low pressures up to 2 psi, larger flow passages and drilled ports for higher flows through the valves. With a high flow of CV of .57, compact size, and economy, this solenoid valve can be used for commercial cookers or any kind of gas-fired heaters, decorative gas-fired lights, infrared heaters, small heaters, patio heaters, and more.

Stainless Steel Series 58 Solenoid Valves

Manifold Mount on 10-32 Female Threads

In addition to our line of molded 58 series solenoid valves, we have developed two stainless steel bodies that supplement the six models of plastic valves used in portable medical devices, analyzers, portable test equipment and similar applications.

Two stainless steel bodies are offered in 2-way normally closed 10/32 stud mount (valve shown on left), and 3-way normally closed, piped exhaust, 10/32 female ports (valve shown on right).

Screw-In Series 20 Solenoid Valve Bodies Offered with Large Ports

Our large port Screw-in Series 20 valve body is for simplified manifold mounting and speed in processes involving liquid or gaseous media. Compatible with brass, stainless steel, or anodized aluminum manifolds. These brass bodies incorporate dual O-rings to eliminate leakage and provide the required high burst pressure ratings.

Welded Stainless Steel Fittings

Series 50

Series 50, 3-way, Directional Control Valve with stainless steel components and FKM seals for oxygen service incorporate welded fittings with threaded ends. Valves are designed to meet requirements in analysis equipment and other applications requiring welded components.

* Minimum order quantities apply.