Below are two Everlasting blowdown valves used on boilers.
The first blowdown valve (below) is a 2" Everlasting Quick Opening Blowdown Valve Fig 4000-A. It is rated for 250 lb. As you can see, it is a lever operated valve and therefore is faster to open.
2" Everlasting Quick Opening Figure 4000
HOW FIGURE 4000 SERIES OPERATES:
Line pressure and heavy spring hold the disc firmly against the body seat, sealing off the flow. When operated, the disc slides across the body seat pushing harmful boiler scale away, and wiping clean the precision tapped surfaces.
Hand adjustment of the post packing is eliminated. Post packing is self-adjusted by a spring and line pressure. This prevents destructive erosion and leakage of stuffing box.
2" Everlasting Slow Opening Figure 4060
EVERLASTING VALVE MODELS
Everlasting - Boiler Blowdown Valves by Everlasting - Boiler Blow Off Valves