DESCRIPTION (COMPLETE)
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We Claim:
1. An improved steam trap device comprising of a body (4) having a common base, characterized in that said body being provided with:
an inlet means (7) and an outlet means (8) connected to first and second chambers by a passage extending through said body for condensate to enter and discharge,
a first (1) and a second chamber (2) connected in series with the said common base and communicating with each other through an orifice (1-3) in said common base, each said chamber being provided with respective covering means (1-5 and 2-5),
the inlets of each of said first and second chambers is provided with a filtering means (3-A & 3-B) to filter said condensate,
the first chamber (1) being provided with a moving valve (1-1) with an integral control disc (1-4) dividing the said first chamber (1) into a first control part and a lower part, said control disc (1-4) is provided with a plurality of containment means on the upper surface thereof for holding and retaining condensate for the purpose of creating sufficient volume thereof in said upper control part of the said first chamber (1), said moving valve (1-1) being provided also with a first annular orifice (1-3) between the outer periphery of the annular disc (1-4) and the inner wall (4-1) of the covering means of said first chamber (1), stem of said valve (1-1) being provided with a second orifice (2-3) connected to the outlet means of said first chamber (1) through a passage means (4-3) extending from said seat (1-2) of said moving disc valve (1-1) to said outlet (8) of the body, said outlet means of said first chamber (1) being connected to the inlet (4-2) of said second chamber through said body base, said body is provided with a trap (3-A) for trapping dense contaminants such as sludge, dirt and the like to be trapped therein from the condensate stream before it enters the second chamber (2), said trap (3-A) being provided in the passage (4-4) between the first chamber (1) and the second chamber (2), and a hole being provided in the passage (4-4) between the first (1) and the second chamber (2),
said second chamber (2) being provided with a moving disc valve (2-1), an annular passage (4-5) being provided in said second chamber (2) extending from the seat
of said moving disc valve (2-1) in said second chamber (2) to the outlet means (8) of said body.
2. A steam trap device as claimed in claim 1, wherein an annular passage (4-1) is provided between said stem of said valve (1-1) in said first chamber and seat (1-2) of said valve for a main stream of condensate to pass there through.
3. A steam trap device as claimed in claim 1, wherein said annular orifice (1-3) provides a passageway for entering condensate thereby allowing a control stream which collects in said upper control part of said first chamber (1) above said control disc (2-1).
4. A steam trap device as claimed in claim 1, wherein said orifice (1-3) and said passageway (4-3) in said stem and said valve seat annular passage being connected to inlet (7) to said second chamber (2) through a hole in said common base (4).
5. A steam trap device as claimed in claim 1, wherein said passage (4-4) extends from said inlet (7) to said second chamber (2) to the lower side of said moving disc valve (2-1) in said second chamber (2).
6. A steam trap device as claimed in claim 1, wherein the said containment means has grooves, pots, pits, or indentations on said upper surface of said control disc (1-4).
7. A steam trap device as claimed in claim 1, wherein the said moving disc valve (2-1) in the second chamber (2) is at a slight skew to facilitate easy lift off when the condensate enters the second chamber (2).
8. A steam trap device as claimed in claim 1, wherein the said filtering means (3-B) comprises of strainers which is cylindrical in shape.
9. A steam trap device as claimed in any preceding claim wherein the said covering means on the first (1) and second (2) chambers are threaded overcaps (1-5 and 2-5),
covering both said chambers and connected to said body to provide weather protection to said chambers.
10. A steam trap device as claimed in claim 1, wherein said valve stem and valve seat (1-2) of said first chamber (1) is cylindrical.
11. A steam trap device as claimed in claim 1, wherein said trap (3-A) provides an outlet means which is operable online to remove dirt or sludge trapped therein.
12. A method for removing condensate from steam lines and/or equipment or volatilized liquid lines and/or equipment with a steam trap device as claimed in any of the preceding claims wherein:
steam enters chamber (1) to form condensate which is heated up and the flow in entering the control chamber above valve (1-1), flashes and increases the volume of the control flow thereby choking the discharge through the control orifice (1-3),
pressure in the control chamber builds up thereby closing the valve (1-1) and stopping all discharge of hot condensate except for a small amount that flows through the control orifice (1-3),
the above cycle is continuously repeated at regular intervals depending upon the propensity of the condensate at a high pressure and temperature to flash into steam at a lower pressure,
hot condensate then enters into second chamber (2),
remnant condensate is also passed through the discharge means (1-5) to the outlet passage of said first chamber,
pressure of the condensate lifts the disc valve (2-1) off its seat allowing free and immediate discharge which continues until flashing condensate approaches steam temperature,
then high velocity jets of flash steam move radially across the underside of the disc valve (2-1) reducing the pressure in this area and, by recompression, build up the pressure in the control chamber (2) above the disc valve (2-1) the combined action of which drives the disc valve (2-1) on to its seat affecting a tight closure of the trap at
saturated steam temperature,
while closed, steam pressure acting over the total upper disc area has a greater force than inlet pressure acting over the smaller inlet area holding the disc tightly on its seat,
heat transfer for the trap inlet maintains control chamber temperature and pressure ensuring tight closure during no load conditions,
when condensate reaches the trap inlet, this heat transfer rate is reduced causing the pressure in the control chamber (2) to fall and the trap immediately opens and this cycle also repeats automatically, the said condensate entering the said body through an inlet means (7) is passed to the steam trap through filtering means (3-B) and enters through passage means (4-3) provided in the body of the steam trap,
the said condensate travels through two different paths as a main condensate flow path and as a controlled condensate flow path,
the main condensate flow path is through annular space created in the valve seat (1-2) due to lifting of the valve (1-1) from its seat,
the controlled condensate flow path is through orifice (2-3) located in the valve stem of valve (1-1) by passing continuously up into the control chamber through the annular orifice around the control disc (1-4),
the said main condensate and the said controlled condensate enter the passage (4-4) in the steam trap body (4) and the combined stream passes through the strainer screen (3-A) and enter into second valve chamber (2) from the bottom through orifice (2-3), the pressure of the condensate lifts the valve seat (2-1) and the flow of condensate is established through annular space located in the valve body (2-1) and the condensate then finally comes out through passage (4-5) into the port (8) and collected in a collection pit.
13. A method as claimed in claim 12, wherein said moving disc valve (2-1) being adapted to be lifted off its seat to enable condensate entering said second chamber (2) from said first chamber (1) to pass out through said annular passage means (4-3), whereby condensate of said control stream and said main stream flow freely but on being heated a flashing action takes place in the first chamber (1) and said control disc (1-4) is forced
down and said stem engages said seat (1-2) to stop said main stream, a small control flow being allowed to pass through said valve stem, said discharge means (1-5) allowing the release of remnant condensate to be discharged into said outlet (1-3) of said first chamber (1) for onward transport to said second chamber (2).
14. A method as claimed in claim 12, wherein when the system is heating up the condensate in the first chamber (1) is not at high temperature and builds up in the control chamber.
15. A method as claimed in claim 12, wherein the flow through the control orifice (1-3) does not change volume and the discharge through the orifice (1-3) reduces the volume in the control chamber and lowers the pressure in the control chamber and the valve in the first chamber (1) opens up to discharge condensate.
16. A method as claimed in claim 12, wherein the valve (1-1) lifts from its seat (1-2) due to pressure of condensate.