German Duplomatic valves Duplomatic models Duplomatic prices

Duplomatic 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 the goal of automatically blocking steam and draining water. 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.

Duplomatic 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. It has no wearing parts and offers a long service life. The steam trap is equipped with the Y series automatic air venting device, which is highly sensitive, can automatically vent air, and ensures high operational 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, causing the condensate level to rise and the float to rise, opening the valve. Condensate is rapidly discharged, and steam quickly enters the equipment, causing it to heat up rapidly. The temperature-sensitive liquid in the Y series automatic air venting device expands, closing the automatic air vent. The steam trap then begins normal operation, with the float rising and falling with the condensate level to block steam and drain condensate. The valve seat of the free float steam trap is always below the liquid level, forming a water seal with no steam leakage, resulting in excellent energy-saving effects. Minimum working pressure 001Mpa; it provides continuous drainage from 001Mpa up to the maximum operating pressure range, unaffected by temperature and working pressure fluctuations. It can discharge condensate at saturation temperature, with a minimum subcooling of 0℃, ensuring no water remains in the heating equipment and enabling optimal heat exchange efficiency. The back pressure rate is greater than 85%, making it one of the most ideal steam traps for process heating equipment. 2) Free semi-float steam trap: The free semi-float steam trap has only one moving part: a semi-float bucket 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, fault-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 enabling optimal heat exchange efficiency. When the device starts up, air and low-temperature condensate in the pipeline enter the steam trap through the emission tube. The bimetallic air vent element inside the valve pushes the bucket open, opening the valve, 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, causing the bimetallic air vent element to contract. The bucket floats toward the valve port, closing the valve. When the steam in the bucket condenses into condensate, the bucket loses buoyancy and sinks, opening the valve and rapidly discharging condensate. 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 large discharge volume in a small size. 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: The inverted bucket steam trap contains an inverted bucket 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. It has a small subcooling degree, a steam leakage rate of less than 3%, and a maximum back pressure rate of 75%. It has more connecting parts and is less sensitive than 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 difference is less than 01MPA. When the device starts up, 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, causing the inverted bucket to rise and drive the lever to close the valve core. A small hole is opened on the inverted bucket. When part of the steam is discharged through the small hole, another part condenses into condensate. The inverted bucket loses buoyancy and sinks due to its own weight, driving the lever to open the valve core. It operates in a cycle, draining intermittently. 5) Combined superheated steam steam trap: The combined superheated steam 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 has an advanced and reasonable structure. Under working conditions of superheat, high pressure, and small load, it can promptly discharge condensate formed when superheated steam disappears, effectively preventing superheated steam leakage, and ensuring high operational quality. The maximum allowable temperature is 600℃. The valve body is made entirely of stainless steel, and the valve seat is made of hard alloy steel. It has a long service life and is a specialized steam trap for superheated steam. It has obtained two national patents, filling a domestic gap. When condensate enters the lower valve chamber, the float of the auxiliary valve rises with the liquid level, closing the steam inlet pipe hole. The 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, opening the auxiliary valve.Steam enters the inverted bucket in the upper main valve chamber through the steam inlet pipe. The inverted bucket generates upward buoyancy, and the inverted bucket drives the valve core to close the main valve. When the condensate level in the auxiliary valve chamber rises again, the next cycle begins, draining intermittently.

Duplomatic valve selection

When selecting a steam trap, do not choose based solely on the maximum discharge capacity. Pay special attention: It is strictly prohibited to select a steam trap based only on the pipe diameter. Selection must be based on steam trap selection principles and combined with 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 the requirements for condensate discharge. For heating equipment that requires the fastest heating speed and strict control of heating temperature, it is necessary to ensure that condensate does not accumulate in the heating equipment. Any water present must be discharged immediately. In this case, it is best to choose a mechanical steam trap that can discharge saturated water. Because it is a steam trap that discharges water as soon as it appears, it can timely eliminate the 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, water accumulation is permissible, such as in steam heating drainage and process tracing line drainage. In these cases, it is best to choose a thermodynamic steam trap. For medium and low-pressure steam transmission pipelines, the condensate generated in the pipeline must be rapidly and completely discharged; otherwise, water hammer accidents are likely to occur. An increased water content in the steam lowers the steam temperature, failing to meet the process requirements of the 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. The nominal pressure of steam traps is generally divided into: 06Mpa, 10Mpa, 20Mpa, 25Mpa, 40Mpa, 50Mpa. When selecting, the nominal pressure of the steam trap must not be lower than the maximum working pressure of the steam-using equipment. At the same time, select the valve body material based on the nominal pressure, maximum working temperature, and installation environment of the steam trap. 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 steam used. Steam traps have two installation methods: horizontal and vertical, determined by the connection position between the pipeline and the steam trap. The connection methods for steam traps include threaded, flanged, welded, and wafer types. 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 conditions of the equipment used, the discharge capacity of the steam trap under various pressure differences is an important factor in selection. If the discharge capacity of the selected and installed steam trap is too small, it will not be able to timely discharge all the condensate reaching the steam trap, causing the condensate to be blocked and flow back, ultimately leading to blockage and significantly reducing the heating efficiency of the equipment. 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, the manufacturing cost will also increase, which is not economical. Therefore, the amount of condensate generated in the equipment or pipeline must be correctly measured or calculated using formulas to provide conditions for the correct selection of the steam trap.

Duplomatic valve structure

Good sealing performance, but the entire load of the working medium on the sphere is transmitted to the outlet sealing ring. Therefore, consideration must be given to whether the sealing ring material can withstand the working load of the medium on the sphere. Under high pressure impact, the sphere may shift. This structure is generally used for medium and low-pressure ball valves. Fixed ball valve Fixed ball valve The sphere of the ball valve is fixed and does not move under pressure. Fixed ball valves are equipped with floating valve seats. Under medium pressure, the valve seat moves, pressing the sealing ring tightly against the sphere to ensure sealing. Bearings are usually installed on the upper and lower shafts of the sphere, 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, large-diameter ball valves.

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