J. H. SEWALL.
STEAM'TRAP. No. 863,552.
Patented May 24, 1887.
UNITED STATES PATENT OFFICE.
JAMES H. SEWALL, OF PORTLAND, MAINE, ASSlGNOR TO THE SEVALL SAFETY OAR4 HEATING COMPANY, OF SAME PLACE.
SPBQIFICATION forming part o Letters Patent No. 363,552, dated May 24, 1887. Application filed September 14, 1886. Serial No. 213,515. (No model.)
To aZZ whom it may concern: with a cylindrical opening or chamber, c,into 1 Be it known that I, JAMES H. SEWALT., of which is placed and in which slides apiston. Portland, county of Gumberland,and State of The inlet-passage a communicates with the Maine, have invented an Improvement in valve-chamber o. v 5 Steam-Traps, of which the following descrip- The piston, as herein shown, is composed of 55 tion, in connectionwith the accompanying l two disks, d d', joined together by a tubular drawings, is a specification, like letters on the stern, 2, a rod, di, having a head, 2, being drawings representing like parts. passed longitudinally through the piston and This invention has for its object to improve a cap at one end thereof, the said rod being l 1o that class of steam-traps employing thermo- Vretained in the piston and holding the cap in 6o static devices for controlling the discharge of place by a nut screwed upon one end thereof. water of condensation. Y (See Fig. 1.) The head 2 has ears 3. The open- Theinvention consists of a shell or casehav ing or chamber c',at a point between the Vtwo ing suitable inlet and outlet passages,through disks of the piston, is provided with an outlet which the water of condensation and steam or discharge passage, ci, so that water of con- 65 pass, and a thermostatic device sensitive to densation and steam passing through the inlet-` variations in temperature contained within passage a and around the stem d2 ofthe piston the said shell or case, combined with a sliding is discharged through the outlet c4t when the piston for opening and closing the inlet-pasl piston is in its rearward position, as shown in 2o sages, and means, substantially as' will be de- Fig. 1. 7o
scribed, operated positively by the thermo- The thermostatic device, herein shown as a stat-ic device for moving the piston back and sealed vessel, V, secured to the frame c below forth.
, the chambered portion e', and filled'with any My improved trap consists, essentially, of a suitable expansive material,has at its expanv2 5 shellhavlng at one enda removablehead-piece, sible face an ear or projection, 14:.
which at its inner side supports a frame, pro- The lower end of the frame c is provided vided with acylindrical opening for the recepwith an arm, c5, secured thereto, to the end of tion of apiston connected to a lever pivoted which, at 15, is pivoted the outer operating-leupon a projection at the inner end ofthe said ver, L,which,extended vertically, is connected frame, the said lever being actuated more or to the ear 14, and so as to be actuated by the 8O less by a thermostatic device consisting, as thermostatic device, the upper end of the said herein shown, of a sealed vessel supported operating-lever being loosely connected with within the frame, one part of the said vessel the piston by apin,16, passing through the end being jointed to the said lever and operating of the said operating-lever L and the ear 3.
to move the piston, as will be described. When the temperature is sufficiently low, 85
Figure 1 shows in vertical section a steamthe thermostatic vessel is collapsed, as shown trap embodying this invention; Fig. 2, a side in Fig. 1, leaving the piston to allow water of elevation ofthe head-piece and the operating condensation and steam to be discharged freely, parts of the steam-trap attached thereto rebut when steam enters the shell or case the 4o moved from the shell or case, and Fig. 3 a top vessel V is expanded to move the operating- 9o view ofthe steam-trap. lever L, and with it the piston, until the disk d The main shell or case A of the trap receives thereof closes the discharge passage or orifice in one end of it the head-piece B,the said parts c4, thus cutting off the steam as well as the being screwed together. The head-piece is water of condensation. The steam being thus provided with an inlet, a, and the shell with cut ofi', the thermostatic device gradually col- 9 5 an outlet-passage, b,forthe admission'and disi lapses until the disk d opens the discharge charge of water of condensation and steam. port or orifice c* and allows the passage of The head-piece has secured to its inner side a water of condensation and steam. frame, c, which enters the shell or case, the The steam-trap herein shown is especially 5o said frame near the head-piece being provided applicable for automaticallyemptying resern 10o shall freeze. moved to open the inlet in low temperature I claim` and to close thenletin high temperature, sub- 1. In a steam-trap, the shell or case having stantially as described. lo suitable inlets and outlets, the frame c, placed 3. In a steam-trap, the shell or case oom- 35 within the shell or case, said frame having an posed of the shell A and cover B, having a 15 in the said opening at the upper end ofthe anda thermostatic device for moving the 4o frame c, the lever for moving said piston, and lever, all supported by the cover B, so that the thermostatio device, sensitive to changes the device may be readily put together and in the temperatnre,f0r moving the lever to taken apart, all substantially as described. close the inlet during high temperatures only, In testimonywhereof Ihave signed my name zo substantially as described. to this specification in the presence of two 45 2. In a steam-trap, the shell or case having I subseribil'ig Witnesses. a suitable inlet and outlet passage, the frame JAMES H. SEWALL. c, placed Within the shell or case. said frame f Witnesses: having an opening at its upper end in commn- DANIEL D. SEWALL, 25 nieation both with the inlet and also with the CHAs. B. STROUT,