clapper valve การใช้

• A one-way clapper valve permitted fresh water to leave at low tide.
• The clapper valve often also has a spring that keeps the gate shut when there is no forward pressure.
• Another variation of this mechanism is the "'clapper valve "', used in applications such firefighting and fire life safety systems.
• The first US patent for an air purifying respirator was granted to Lewis P . Haslett in 1848 for his'Haslett's Lung Protector,'which filtered dust from the air using one-way clapper valves and a filter made of moistened wool or a similar porous substance.