Inverted bucket pilot-operated steam trap

I. Introduction:
   The inverted bucket pilot steam trap functions to discharge condensate, air, and carbon dioxide from steam systems, while automatically preventing steam leakage to the greatest extent possible. There are many types of steam traps, each with different performance characteristics. When selecting a steam trap, first choose one whose specific performance meets the operational requirements of the steam heating equipment, then consider other objective conditions. This is the correct and effective way to select the steam trap you need. Steam traps are used in equipment that utilizes steam, where only steam is required. Condensate will definitely form inside such equipment, and this condensate becomes a harmful fluid. Additionally, air and other non-condensable gases mix in, causing equipment malfunctions and reduced performance.

II. Precautions:
1. Before installation, clean the piping and equipment to remove impurities and prevent clogging.
2. Steam traps should preferably be installed below steam-using equipment and in locations where drainage is easy.
3. Steam traps should be installed in easily accessible locations for maintenance, and arranged as centrally as possible for convenient management.
4. Each steam heating equipment should be equipped with its own steam trap.
5. The bypass pipe must not be installed at a lower level than the steam trap.
6. During installation, ensure the arrow direction on the valve body aligns with the flow direction of the medium in the piping.
7. The piping at the inlet and outlet of the steam trap should have a downward slope of 4%, and the nominal diameter of the piping must not be smaller than that of the steam trap.
8. If the drainage capacity of a single steam trap is insufficient, multiple steam traps can be installed in parallel. In locations where freezing may occur, antifreeze measures must be implemented.

III. Features and Performance:
1. Highly adaptable to condensate load, capable of both intermittent and continuous discharge.
2. Equipped with a large-capacity double-seat differential mechanism and SCCV (Steam Control Check Valve) shutoff system, delivering high discharge capacity in a compact size.
3. All internal components are made of stainless steel and mounted on the valve cover, making maintenance extremely convenient.
4. High backpressure rate of 90%.
5. Reliable steam-water separation: Steam and water enter from the lower part of the valve via a U-shaped passage, and the valve remains in a water-sealed state at all times, effectively preventing steam leakage.
6. The open-type float resists water hammer, and the bucket is equipped with an overflow vent, effectively preventing steam lock and air binding.
7. When combined with a lever mechanism, it can be manufactured as a high-pressure valve.

IV. Working Principle:

The inverted bucket pilot steam trap has only one semi-floating bucket as its moving component, with its opening facing downward. The bucket serves as both the opening/closing element and the sealing element. When the system is first started, air and low-temperature condensate in the pipe enter the steam trap through the discharge pipe. The bimetallic air-venting element inside the valve pops the bucket open, allowing the valve to open and rapidly discharge air and low-temperature condensate. When steam enters the bucket, it generates upward buoyancy. At the same time, the temperature inside the valve rises, causing the bimetallic air-venting element to contract. The bucket floats toward the valve seat, closing the valve. When the steam inside the bucket turns into condensate, the bucket loses buoyancy and sinks downward, opening the valve to rapidly discharge the condensate. When steam enters the bucket again, the valve closes, creating an intermittent and continuous operating cycle. Since the valve seat is isolated by a water seal, steam and water are separated, resulting in no steam leakage during operation.