PROBLEM TO BE SOLVED: To provide a lever float type drain trap capable of setting off fluid pressure acting on a valve element, without leaking gas, to open and close a large valve port.;SOLUTION: This drain trap is provided with a lever 16 rotating around a swinging shaft 15 supported in a valve chest 6, a float 17 floating up and down in response to a liquid level in the valve chest 6 is connected to the lever 16, and the valve element 12 is connected to the lever 16, to open and close the valve port 9 by seating and separation onto/from a valve seat 7. The valve seat 7 is cylindrical-shaped, both end thereof is opened to the valve chest 6, and the periphery thereof is communicated with an outlet 2 by a discharge hole 8. The valve element 12 is cylindrical-shaped, one end thereof is opened, and the other end is closed by a wall member 13, to open and close the valve port 9 in a one-end opening side of the valve seat 7 by an annular valve face 14 in the one-end opening side and to make an outer circumference in a wall member 13 side of the other end slide airtightly on a sliding part 10 of an inner circumference in the other side opening side of the valve seat 7. A peripheral wall 24 of the valve element 12 includes an orifice 23 formed in an opening area where drain generated at the time of blow in a piping system is not discharged completely.;COPYRIGHT: (C)2011,JPO&INPIT
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