Exhaust Valve Homemade (Semi-Auto Capable)

This parts list will provide you with the parts to build a version 1.0 exhaust valve homemade, with the capabilities to later implement a bladder for semi-automatic firing. The trigger is what allows for this.

McMaster order:
1 x 6646K33: Quick-Exhaust Air Valve without Flow Control (Right Angle, 1/8 NPT Female x 1/4 NPT Female) ($19.05)
1 x 50265K23: Multirange Brass Pop-Safety Valve (1/4 NPT Male, 25-200 PSI) ($5.88)
1 x 5346K61: Brass Barbed Hose Fitting (Adaptor for 1/8” Hose ID x 1/8” NPTF Male Pipe) (pack of 10) ($10.67)
1 x 5233K52: Masterkleer Pvc Tubing 1/8” ID (1/4” OD, 1/16” Wall Thickness, 25 Ft. Length) ($3.25)
1 x 5463K38: Durable Nylon Tight-Seal Barbed Tube Fitting (Straight for 1/8” Tube ID, White) (pack of 10) ($6.05)
2 x 4568K131: Standard-Wall Brass Threaded Pipe Nipple (1/4 Pipe Size x 7/8” Length, Fully Threaded) ($1.66 ea)
3 x 4880K199: Standard-Wall White PVC Pipe Fitting (1/2 Pipe End Male x 1/4 NPT Female, Hex Bushing) ($0.67 ea)
1 x 4880K636: Standard-Wall White PVC Pipe Fitting (1/2 Pipe Size, Wye) (recommended) ($1.51)
1 x 4591K12: Commercial Grade Pipe Thread Sealant Tape (16 Yard L x 1/2” Wide) ($2.31)

Total cost of McMaster order (without shipping): $54.05

Clippard/local distributor/eBay:
1 x MJVO-3 or similar (3-way normally open valve; aim for flow rate of at least 10 CFM at 100 PSI) (~$20.00)

Total cost of online orders (without shipping): $74.05

Local store (recommendation for tank construction):
Cristy’s Red Hot Blue Glue, or PVC primer and cement
2 x 1-1/4” to 1/2” PVC bushing
2 x 1-1/4” PVC coupler
1 x 1-1/4” PVC (10’ length)
1 x 1/2” SCH 40 PVC (10’ length)

Find a pump somewhere (I recommend a cheap Schwinn frame pump from Amazon or a large chain store).