Instructions for use of a free semi float steam trap

1.Operating Differential Pressure: Operating Differential Pressure: The pressure difference between the inlet pressure and the outlet pressure (back pressure) of the trap. If the outlet end is atmospheric, the back pressure is zero; If the pressure fluctuates, the maximum pressure difference should be taken.

2.Maximum displacement: The amount of condensate generated by the steam equipment should be multiplied by the standby factor. The standby coefficient is generally taken as 2 4 (the standby coefficient of drum drying equipment is taken as 6 10). 1.Dirt and debris in the pipes must be eliminated before installation.

2.The trap must be installed at a lower discharge point than the steam-using equipment and in a location that is easy to inspect and service. If it is installed at a higher point than the drainage point, a lifting joint is required.

3.The trap should be installed horizontally, and the arrows at the inlet and outlet should be consistent with the direction of the drain flow.

4.The steam trap should be equipped with a shut-off valve and a bypass valve, the height of which should not be lower than the steam trap. If several traps are connected to the same return pipe, a check valve should be installed at the outlet of each trap.

5.It is not advisable to share the same trap with several steam-using equipment, that is, one steam-using equipment should be equipped with one trap. When the trap is discharged bit by bit, it is often accompanied by secondary steam drifting out, which is formed by the re-evaporation of high-temperature condensate in the atmosphere.

This is normal and not a steam leak. Fault Condition Fault Cause Troubleshooting Method No Water Drain Filter Screen, Launch Duct, Half Float Exhaust Hole or Drain Nozzle Blocked Cleaning No Water Discharge Working Pressure Difference Exceeds the Limit, Float Does Not Sink Switch to a Suitable Model Poor Drainage Blocked Filter, Launch Conduit or Drain Nozzle Cleaning Poor Drainage Insufficient Drain Valve Displacement Switch to a Suitable Model Poor Drainage Does Not Meet the Trap Operating Pressure Difference Switch to a Suitable Model Leakage Damaged Valve Cover Gasket Tighten the bolt or replace the gasket Leak Leak Half Float and drain nozzle are not sealed Take out the Half Float and apply abrasive sand, Grinding back and forth close to the nozzle until the fit is good Steam spray Nozzle is not sealed Grinding nozzle Steam spray The working pressure difference fluctuates too much and too fast, destroying the water seal in the valve Close the shut-off valve in front of the trap for 1 2 minutes, and then open it slowly to resume normal operation Steam spray Bypass valve fails Replace the bypass valve.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The free float® trap uses the principle of Archimedes buoyancy to make the float rise and fall with the rise and fall of the liquid level in the body cavity, so as to open or close the drain hole of the valve seat to form a drainage and steam resistance. When the work starts, the manual air release valve located on the valve cover is opened, and a large amount of cold air or non-condensable gas is removed from the body under the push of steam and condensate, and the air release valve is closed. At this time, the trap is in a closed state, and the condensate flowing into the valve gradually increases with the continuation of time, that is to say, when the liquid level in the body cavity rises to the point where the buoyancy is greater than the weight of the ball itself and the force of the valve port area, the ball floats and opens the valve port, and a large amount of condensate is quickly discharged to the back of the valve.

In the process of drainage, the liquid level gradually decreases, due to the uneven pressure distribution in the body cavity, the pressure at the valve port is the lowest, so that the float floating on the liquid surface is subjected to unbalanced force, and the float is pushed to float to the valve port until the valve port is closed, at this time, the bottom fulcrum of the body resists the float, so that the float can not continue to fall, and the drainage stops. At this point, there is a certain distance between the liquid level and the valve port, so a water seal is formed to prevent steam from escaping.

1.The maximum discharge capacity of the trap = the amount of condensate generated by the steam-using equipment Standby factor.

The standby coefficient of drum drying equipment is taken 6 10, and the standby coefficient of other equipment is taken 2 42Working Status:

1) The action of a free semi-float trap depends on the amount of condensate. The following conditions are normal: Condensate Discharge status Very little Bit by bit Medium Medium intermittent discharge A lot Continuous discharge (2) Free semi-float traps are accompanied by secondary steam (high-temperature condensate is formed by re-evaporation in the atmosphere) when discharged, and it is normal that it is not steam leakage.

3.The displacement range refers to the maximum displacement of the type of trap between the differential pressure and the standard pressure differential.

4.It can be customized according to the special requirements of users for working pressure difference, condensate discharge and interface diameter.

When the trap starts, the hemispherical float UFO (4) sinks on the launch pad (7), and the condensate flows into the valve cavity through the small hole on the filter screen (3) and the launch guide (6) under the effect of the pressure difference between the inlet and outlet (see Fig. 1);

When the steam enters, the condensate in the UFO of the hemispherical float is squeezed out, and the buoyancy gradually increases, forcing it to float up to coincide with the drainage nozzle, and the trap is in a state of steam blocking (see Fig. 2).

When the condensate re-enters the hemispherical float UFO, its buoyancy decreases and sinks, and the trap returns to its state (Fig. 1).

In this way, the reciprocating circulation achieves the purpose of steam resistance and drainage.

According to the principle of phase change, this type of trap relies on the different thermodynamic principles of flow velocity and volume changes when steam and condensate pass through, so that different pressure differences between the upper and lower parts of the valve plate are generated, and the valve plate is driven to open and close the valve. Because the working power of the thermodynamic trap is the first to steam, the steam waste is relatively large. The structure is simple, water hammer resistant, the maximum back is 50%, there is noise, the valve plate works frequently, and the service life is short.

Thermodynamic traps are thermodynamic (disc type), pulse type, orifice type Thermodynamic traps have a movable valve plate inside, which is both a sensitive part and an action actuator. According to the different thermodynamic principles of the flow rate and volume change when steam and condensate pass through, different pressure differences are generated between the upper and lower parts of the valve plate, and the valve plate is driven to open and close the valve. The steam leakage rate is 3%, and the subcooling degree is 8 -15.

When the device is started, the pipeline cools the condensate, and the condensate pushes the valve plate open by the working pressure and is quickly discharged. When the condensate is discharged, the steam is discharged subsequently, because the volume and flow rate of the steam are larger than the condensate, the pressure difference between the upper and lower parts of the valve plate is generated, and the valve plate is quickly closed under the suction force of the steam flow rate. When the valve plate is closed, the valve plate is subjected to pressure on both sides, and the force area below the valve plate is less than the force area above, because the pressure in the steam chamber of the trap valve is ** than the steam pressure, so the force on the valve plate is greater than that below, and the valve plate is tightly closed.

When the steam inside the trap chamber cools down to condensate, the pressure inside the chamber disappears. The condensate is pushed open by the working pressure, and the condensate continues to be discharged, circulating work, and intermittent drainage. Orifice traps are designed to control the displacement of orifice plates with different pore sizes according to different displacements.

The structure is simple, and if the selection is not suitable, there will be insufficient drainage or a large amount of steam, and it is not suitable for intermittent production of steam-using equipment or steam-using equipment with large fluctuations in condensate volume.

Free Float® steam traps play a role in blocking steam drainage in steam heating systems, and choosing the right trap can make the steam heating equipment achieve the highest working efficiency. In order to achieve the best results, it is necessary to have a comprehensive understanding of the working performance and characteristics of various types of traps. This type of valve should generally be installed horizontally in the pipeline.

There are many types of traps, each with different properties. When choosing a trap, you should first choose its characteristics to meet the optimal operation of the steam heating equipment, and then consider other objective conditions, so that the choice of the trap you need is correct and effective.

Traps need to be able to "identify" steam and condensate in order to act as a steam barrier drain. The "identification" of steam and condensate is based on three principles: density difference, temperature difference, and phase transition.

Therefore, three types of traps are manufactured according to three principles: mechanical, thermostatic, and thermodynamic.

Operates on changes in the condensate level in the steam trap, including:

Float type: The float is a hollow sphere closed by a large cluster.

Open upward float type: The float is a barrel type with an open upward opening.

Open downward float type: The curved filial piety float is a barrel type with an opening downward.

This type of trap uses the temperature difference between steam and condensate to cause the deformation or expansion of the temperature sensing element to drive the valve core to open and close the valve. The supercooling degree of thermostatic trap is relatively large, generally the subcooling degree is 15 degrees to 40 degrees, it can use part of the sensible heat in the condensate, there is always high temperature condensate in front of the valve, no steam leakage, and the energy saving effect is remarkable. It is the most ideal trap in steam pipelines, heat tracing pipelines, small heating equipment, heating equipment, and small heating equipment with low temperature requirements.

The main action element of the diaphragm box trap is the metal diaphragm, which is filled with a liquid whose gasification temperature is lower than the saturation temperature of water, and there are two options for opening the valve with a temperature lower than the saturation temperature of 15 and 30. The diaphragm trap is particularly responsive, not afraid of freezing, small in size, resistant to overheating, and can be installed in any position. The back pressure rate is greater than 80%, it can discharge non-condensable gas, the diaphragm box is firm, the service life is long, the maintenance is convenient, and the use range is very wide.

When the device is just started, the pipeline is condensed at a low temperature, the liquid in the diaphragm box is in a condensed state, and the valve is in the open position. When the temperature of the condensate gradually increases, the filling of the membrane begins to evaporate, the pressure in the membrane rises, the diaphragm drives the valve center to move in the direction of closing, and the trap begins to close before the condensate reaches the saturation temperature. The diaphragm box controls the valve switch with the change of steam temperature, which plays the role of blocking steam and drainage.

The spool of a bellows trap is filled with a liquid that vaporizes at a temperature lower than the saturation temperature of water. With the change of steam temperature control valve switch, the valve is equipped with adjustment bolts, can adjust the use temperature according to the need, the general subcooling adjustment range is lower than the saturation temperature 15 -40. The back pressure rate is greater than 70%, not afraid of freezing, small size, can be installed in any position, can discharge non-condensable gas, and has a long service life.

When the device is started, the pipeline appears to cool condensate, the liquid in the bellows is in a condensed state, and the valve core is in the open position under the elastic force of the spring. When the temperature of the condensate gradually increases, the liquid filling in the bellows begins to evaporate and expand, the internal pressure increases, the deformation elongates, and the valve core moves in the direction of closing. The main component of the bimetal trap is the bimetal disc temperature sensing element, which is heated and deformed with the rise and fall of steam temperature, and pushes the valve core to open and close the valve.

The bimetal disc trap is equipped with adjustment bolts, which can adjust the operating temperature according to the need, the general subcooling adjustment range is lower than the saturation temperature of 15 -30, the back pressure rate is greater than 70%, it can discharge non-condensable gas, it is not afraid of freezing, it is small in size, it can resist water hammer, it can withstand high pressure, and it can be installed in any position. Bimetal sheets are fatigued and need to be adjusted frequently.

When the device is just started, the pipe has a low temperature condensation, the bimetal sheet is flattened, the valve core is in the spring elastic force, and the valve is in the open position. As the condensate temperature rises, the bimetal disc temperature sensing element begins to bend and deform, pushing the valve core to the closed position. Before the condensate reaches saturation temperature, the trap begins to close.

The bimetal sheet controls the valve switch with the change of steam temperature to block steam and drain water.