US811420A - Steam-trap. - Google Patents

Description

No. 811,420. PATENTED JAN. 30, 1906. E. A. MARSH.

STEAM TRAP.

APPLICATION FILED MAR.20,19U5.

IWVEWTOR v UNITED STATES ran UFFIOE.

ELON A. MARSH, OF DETROIT, MICHIGAN, ASSIGNOR TO THE GREENAWAY COMPANY, OF DETROIT, MICHIGAN, A CORPORATION.

STEAM-TRAP.

Patented Jan. 30, 1906.

Application filed March 20, 1905 Serial No. 250.901.

to the accompanying. drawings, which form a part of this specification.

This invention relates to steam-traps.

It has for its object an improved trap containing an automatically opening andclosing main valve primarily started by a pilotvalve that is actuated by a float, and the float is contained in the body of the trap and connected to the pilot-valve by suitable levers and links. ,The main valve and the pilotvalve together, when both are closed, form a steam-tight closure across the mouth. of the outlet-pipe, through which the accumulated water is to be finally driven out from the trap. The pilot-valve has but small surface to resist the opening action of the float and is easily opened at the proper time, after which the main valve is opened by the motive force of the water and the steam-pressure which tends to move the water.

In the drawings, Figure 1 is a vertical section through the trap. The valve-easing above the tra is shown in elevation. Fig. 2 is a vertica section through the valve-casing of the valve.

1 indicates the rece tacle part of the trap, in which the waters t lat are to be separatedv from the steam accumulate.

2 is the inlet-pipe into the trap. clean-out opening and valve therefor.

4 is the exit-pipe, through which. the waters are all driven from the trap.

5 is an end of pipe dropping from the outflowpipe 4 towar the bottom of the receptacle part of the trap and dipping into the accumulating waters. At the top of this pipe end 5, between it and the main outflow-pipe 4, is a valve-casing 6, inclos'ing a chamber, in which is held a cylinder-like receptacle 7 for the piston part 8 of a valve that seats against the pipe surrounding the orifice that leads into the outflow-pipe 4. The )iston. part 8 of the valve engages easily or oosely in the cylinder 7 and is provided on the upper side,

3isa

which engages against the valve-seat 10, with a suitable packing gasket 1.1. The entire piston part of the valve is bored and at the upper part of the bore the bore contracts to make a seat 12 for a needle-valve 13, that terminates the upper end. of a valve-stem 14. The lower end of the valve-stem is provided by a slot connection 15 with the end 16 of a lever 17. The lever 17 is pivotally suspended by pin 18 from the bottom end of the pipe 5 and supports the float that normally rests on the water in the trap.

In action the water accumulates in the trap, lifting the float 19 until the buoyancy of the float draws down the stem of the needle-valve and opens a assage through the orifice in the seat of tie needle-valve, and thereby allows any water, air, or steam that may have accumulated in the cylinder 7 underneath the valve to escape freely into the passage 4 and reduces the resistance to an opening movement of the main valve by re lieving the pressure from the under side of said valve. The pressure which is in the valve-chamber external to the cylinder 7 is now su'fiicient to drive the piston 8 into the cylinder and. fully open the passage from the valve-chamber into the pipe 4, and Water is driven. out from the trap until its surface has fallen below the bottom of the pipe5. When in this condition, the pressures on the opposite sides of the main valve are again equalized, or nearly equalized, and the weight of the float is suflicient to lift the needle-valve and. the main valve which now hangs on the end of the needle-valve until the main valve closes against its seat and the needle valve closes against its seat and the exit of the trap is closed.

A sightfeed or gage-glass 20, properly connected to the trap, shows the condition of the water therein at all times.

What I claim is 1. In a steam-trap, a trap-chamber, a valvechamber external to the trap-chamber and above the water accumulating space therein, a main valve having a central passage, a piston-actuator for said valve, a cylinder surrounding said piston open at the top and having space for fluid therein under said piston and having discharge from said space through the said central passage in the main valve, a fluid-discharge pipe depending from the valve-chamber into the water-aceu1nu lating space of said trap, a pilot-valve for controlling the passage through the main valve and a float for actuating said pilotvalve, substantially as described.

, 2. In a steam-trap, a trap-chamber, a valve-chamber external to the trap-chamber and above the water-accumulating space therein, a main valve having a central passage, a piston-actuator for said valve, a cylinder surrounding said piston open at the top and having space for fluid therein under said piston and having discharge from said space through the said central passage in the main valve, a fluid-discharge pipe dependingfrom the valve-chamber into the water-accumulating space of said trap, a pilot-valve for controlling the passage through the main valve and a float for actuating said pilotvalve, a pivot-and-slot connection between said float and pilot-valve, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

ELON A. MARSH.

Witnesses:

CHARLES F. BURTON, MAY E. lion.

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