German FAT valves FAT models FAT prices

FAT valves are known as steam traps, also called automatic drains or condensate dischargers. They are categorized for use in steam systems and gas systems. Steam traps are installed at the end of steam-heated pipelines to continuously discharge condensate from the pipes to the outside. Most steam traps can automatically distinguish between steam and water (excluding thermodynamic types), thereby achieving automatic steam blocking and drainage. Steam traps are widely used in industries such as petrochemicals, food and pharmaceuticals, and power plants, playing a significant role in energy saving and emission reduction.

FAT valve classification

1) Free float steam trap: Simple structure, with only one moving part inside: a finely polished stainless steel hollow float ball, which acts as both the float and the opening/closing component. There are no wearing parts, resulting in a long service life. The steam trap is equipped with a Y series automatic air venting device, which is highly sensitive, can automatically vent air, and ensures high working quality. When the equipment starts up, the air in the pipeline is discharged through the Y series automatic air venting device. Low-temperature condensate enters the steam trap, the condensate level rises, the float rises, the valve opens, and the condensate is rapidly discharged. Steam quickly enters the equipment, causing rapid heating. The temperature-sensitive liquid in the Y series automatic air venting device expands, closing the automatic air venting device. The steam trap begins normal operation; the float rises and falls with the condensate level, blocking steam and draining water. The valve seat of the free float steam trap is always below the liquid level, forming a water seal with no steam leakage, providing excellent energy-saving effects. Minimum working pressure 001Mpa, continuous drainage is unaffected by temperature and working pressure fluctuations from 001Mpa up to the maximum operating pressure range. It can discharge condensate at saturation temperature, with a minimum subcooling of 0℃, ensuring no water remains in the heating equipment and allowing it to achieve optimal heat exchange efficiency. The back pressure rate is greater than 85%, making it one of the most ideal steam traps for production process heating equipment. 2) Free semi-float steam trap: The free semi-float steam trap has only one semi-float bucket as the moving part, with the opening facing downward. The bucket serves as both the opening/closing component and the sealing component. The entire spherical surface can provide sealing, offering a long service life, resistance to water hammer, no wearing parts, failure-free operation, durability, and no steam leakage. The back pressure rate is greater than 80%. It can discharge condensate at saturation temperature, with a minimum subcooling of 0℃, ensuring no water remains in the heating equipment and allowing it to achieve optimal heat exchange efficiency. When the device just starts, air and low-temperature condensate in the pipeline enter the steam trap through the launch tube. The bimetallic air venting element inside the valve pushes the bucket open, the valve opens, and air and low-temperature condensate are rapidly discharged. When steam enters the bucket, the bucket generates upward buoyancy. At the same time, the temperature inside the valve rises, the bimetallic air venting element contracts, the bucket floats towards the valve port, and the valve closes. When the steam in the bucket condenses into water, the bucket loses buoyancy and sinks, the valve opens, and condensate is rapidly discharged. When steam enters the bucket again, the valve closes again, operating intermittently and continuously. 3) Lever float steam trap: The basic characteristics of the lever float steam trap are the same as those of the free float type. The internal structure consists of a float connected to a lever that drives the valve core, opening and closing the valve according to the rise and fall of the condensate level. The lever float steam trap uses double valve seats to increase condensate discharge capacity, achieving a small size with large discharge volume. The maximum condensate discharge capacity reaches 100 tons/hour, making it the most ideal steam trap for large heating equipment. 4) Inverted bucket steam trap: Inside the inverted bucket steam trap is an inverted bucket acting as the level-sensitive component, with the bucket opening facing downward. The inverted bucket is connected to a lever that drives the valve core to open and close the valve. The inverted bucket steam trap can vent air, is resistant to water hammer, and has good anti-fouling performance. The subcooling is small, the steam leakage rate is less than 3%, and the maximum back pressure rate is 75%. It has more connecting parts and lower sensitivity compared to the free float steam trap. Since the inverted bucket steam trap relies on the upward buoyancy of steam to close the valve, it is not suitable for selection when the working pressure differential is less than 01MPA. When the device just starts, air and low-temperature condensate in the pipeline enter the steam trap. The inverted bucket drops due to its own weight, driving the lever to open the valve core, and air and low-temperature condensate are rapidly discharged. When steam enters the inverted bucket, the steam generates upward buoyancy, the inverted bucket rises, and the connected lever drives the valve core to close the valve. There is a small hole on the inverted bucket. When part of the steam escapes through the small hole, another part condenses into water. The inverted bucket loses buoyancy, sinks due to its own weight, and the connected lever drives the valve core to open the valve, cycling work and intermittent drainage. 5) Combined superheated steam trap: The combined superheated steam trap has two isolated valve chambers connected by two stainless steel tubes. It is a combination of a float-type and an inverted bucket-type steam trap. The valve structure is advanced and reasonable. Under working conditions of superheat, high pressure, and low load, it can timely discharge condensate formed when superheated steam disappears, effectively preventing superheated steam leakage, and ensuring high working quality. The maximum allowable temperature is 600℃. The valve body is made of full stainless steel, and the valve seat is made of hard alloy steel, offering a long service life. It is a specialized steam trap for superheated steam, holding two national patents and filling a domestic gap. When condensate enters the lower valve chamber, the auxiliary valve's float rises with the liquid level, and the float seals the steam inlet pipe hole. Condensate rises through the inlet conduit to the main valve chamber. The inverted bucket drops due to its own weight, driving the valve core to open the main valve and discharge condensate. When the condensate level in the auxiliary valve chamber drops, the float descends with the liquid level, and the auxiliary valve opens.Steam enters the inverted bucket in the upper main valve chamber through the steam inlet pipe. The inverted bucket generates upward buoyancy, driving the valve core to close the main valve. When the condensate level in the auxiliary valve chamber rises again, the next cycle begins, resulting in intermittent drainage.

FAT valve selection

When selecting a steam trap, do not choose based solely on maximum discharge capacity. Pay special attention: It is strictly prohibited to select a steam trap based only on pipe diameter. Selection must be based on steam trap selection principles and the specific conditions of the condensate system. Generally, selection should be made based on the following three aspects. 1) First, determine the type of steam trap based on the heating equipment and requirements for condensate discharge. For heating equipment requiring the fastest heating speed and strict temperature control, where condensate accumulation must be prevented and any water must be discharged immediately, it is best to choose a mechanical steam trap capable of discharging saturated water. Because it discharges water as soon as it appears, it can timely eliminate adverse consequences caused by water accumulation in the equipment, rapidly improving and ensuring the heating efficiency required by the equipment. For heating equipment with a large heating surface and less stringent requirements for heating speed and temperature control, where water accumulation is permissible (e.g., steam heating drainage, process tracing line drainage), it is best to choose a thermodynamic steam trap. For medium and low-pressure steam transmission pipelines, condensate generated in the pipeline must be rapidly and completely discharged; otherwise, water hammer accidents are likely to occur. An increased water content in steam lowers the steam temperature, failing to meet the process requirements of steam-using equipment. Therefore, it is best to choose mechanical steam traps for medium and low-pressure steam transmission pipelines. 2) Second, determine the nominal pressure and valve body material of the steam trap based on the maximum working pressure and maximum working temperature of the steam-using equipment; determine the connection method and installation method of the steam trap, etc. The nominal pressure of steam traps is generally divided into: 06Mpa, 10Mpa, 20Mpa, 25Mpa, 40Mpa, 50Mpa. During selection, the nominal pressure of the steam trap must not be lower than the maximum working pressure of the steam-using equipment. Meanwhile, select the valve body material based on the steam trap's nominal pressure, maximum working temperature, and installation environment. For nominal pressure ≤ 10Mpa, select cast iron or carbon cast steel; for nominal pressure > 10Mpa, select carbon cast steel or alloy cast steel. The maximum working temperature of the steam trap is determined by the steam used by the steam-using equipment; the selected temperature should not be lower than the temperature of the used steam. Steam traps have two installation methods: horizontal and vertical, determined by the connection position between the pipeline and the steam trap. Connection methods for steam traps include threaded, flanged, welded, and wafer-type. These must be determined based on the maximum working pressure, maximum working temperature of the steam trap, and the requirements of the corresponding connection parts of the steam-using equipment. 3) Finally, determine the performance parameters of the steam trap based on the discharge capacity. In addition to matching parameters such as pressure and temperature of the steam trap with the equipment conditions, the discharge capacity under various pressure differentials is an important factor in selecting a steam trap. If the selected and installed steam trap has too small a discharge capacity, it cannot timely discharge all condensate reaching the trap, causing condensate blockage and backflow, ultimately leading to clogging and significantly reducing equipment heating efficiency. Conversely, selecting a steam trap with too large a discharge capacity will lead to premature wear and failure of the valve closing components. As the valve body size increases, manufacturing costs also increase, which is uneconomical. Therefore, the amount of condensate generated in the equipment or pipeline must be correctly measured or calculated to provide conditions for the correct selection of steam traps.

FAT valve structure

Good sealing performance, but the entire load of the working medium on the ball is transferred to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the medium on the ball. Under high pressure impact, the ball may shift. This structure is generally used for medium and low-pressure ball valves. Valve fixed ball valve Valve fixed ball valve The ball in a ball valve is fixed and does not move under pressure. Fixed ball valves are equipped with floating seats that move under medium pressure, pressing the sealing ring tightly against the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball, resulting in low operating torque, making them suitable for high-pressure and large-diameter valves. To reduce the operating torque of ball valves and increase sealing reliability, oil-sealed ball valves have been developed. Special lubricating oil is injected between the sealing surfaces to form an oil film, which enhances sealing performance and reduces operating torque, making them more suitable for high-pressure and large-diameter ball valves.

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