Click the series name you are looking for. Digital Catalog Description Relay valve Shuttle valve AND valve Time delay valve Pneumatic Indicator Pneumatic-electric relay Model VR4151, 4152 VR1210, 1220, VR1210F, VR1220F VR1211F VR2110 VR3100, 3110 VR3200, 3201 Operation can be made from the toolbar at the center of the lower portion of the screen. Click here to display the contents. Click here to download the PDF file.