The new Orchids and eBay 2008 database, effective 23 November, Parker PWB-A3469 Blocking valve 251520 - 5/32″
• Integrated Power Components
• Parker Hannifin Corp. Pneumatics Division Valves (Air)
• 5/32″ Tube 1/8″ 1/4″ PWBA3468
• with instant tube fittings
• Made by Parker
• Model number 251520
• New, Overstock
• Parker Hannifin Corp. Pneumatics Division Valves (Air)
• 5/32″ Tube 1/8″ 1/4″ PWBA3468
• with instant tube fittings
• Made by Parker
• Model number 251520
• New, Overstock
Parker PWB-A3469 Blocking valve 251520 BLOCKING VALVE 1/4″ NPT-1/4″.
The blocking valve is a single acting spring return 2/2 valve in a fitting format. The device requires a pneumatic pilot signal to open, which allows free flow of air, gas or liquid to pass. As long as a pilot signal is present, the device will remain open. When the pilot signal is removed, the internal spring will close the blocking valve, bubble tight. The blocking valve is oil serviceable and rated to 150 PSI. These devices have two primary design uses: (1) to prevent unwanted gravity induced motion in cylinders during shut down procedures or during periods of lost supply pressure and (2) freezing the cylinder position by using a blocking valve at each end of the cylinder. Application needs such as tool or work piece protection, horizontal indexing or inspection stops are often satisified by these devices.
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