{"product_id":"barber-colman-ak-51642-pneumatic-relay-module","title":"Barber-Colman AK-51642 Pneumatic Relay Module","description":"\u003cdiv\u003e\u003cp\u003eThe Barber-Colman AK-51642 Pneumatic Relay is a compact two-input pressure selector that automatically routes the lower of two pneumatic pressures to a downstream control point, enabling straightforward, electronics-free logic in pneumatic systems. With a direct-acting actuation design, the unit is rated for a maximum of 30 psi gauge (30 PSIG max) and uses standard 1\/4 in. outer diameter plastic tubing for connections, allowing quick, reliable integration into existing Barber Colman or Invensys control networks without special tooling. The AK-51642 is listed as discontinued by the manufacturer, so buyers typically source remaining stock from authorized distributors or secondary marketplaces rather than new production runs. In typical use, it provides a simple means to implement pressure-based decision logic in industrial automation and HVACR applications: two input pressures are evaluated, and the lower signal is sent to a single output to drive a downstream valve, relay, or actuator, supporting sequencing, priority control, and fail-safe strategies in pneumatic control schemes.\u003c\/p\u003e\u003c\/div\u003e","brand":"BARBER","offers":[{"title":"New","offer_id":51676660269358,"sku":null,"price":94.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_a6666e43-c4e5-4d12-a89a-ae613087c718.jpg?v=1769552043","url":"https:\/\/plgautomation.com\/products\/barber-colman-ak-51642-pneumatic-relay-module","provider":"PLG Automation ","version":"1.0","type":"link"}