Mechanical type, also known as float type, uses the density difference between condensate and steam to open or close the valve flap through the change in condensate level, thus preventing steam from draining. The mechanical type trap has a small subcooling degree and is not affected by changes in operating pressure and temperature, so that water is discharged immediately and no water is stored in the heating equipment, enabling the heating equipment to achieve optimum heat transfer efficiency. With a maximum back pressure rate of 80%, the trap is ideal for production process heating equipment because of its high working quality.
Mechanical traps include free float traps, free and semi-float traps, lever float traps, inverted bucket traps, etc.
1. Free float trap.
The Free Float® trap has a simple structure with only one internal moving part, a finely ground stainless steel hollow float, which is both a float and an opening/closing member, with no wearing parts and a long service life.
When the equipment is first started, the air in the pipeline is discharged through the Y series automatic air venting device, and the low temperature condensate enters the trap, the condensate level rises, the float rises, the valve opens, the condensate is quickly discharged, the steam quickly enters the equipment, the equipment rapidly heats up, the temperature-sensitive liquid of the Y series automatic air venting device expands, and the automatic air venting device closes. The trap begins to operate normally, and the float rises and falls with the condensate level, blocking steam from draining. The seat of the free float trap is always below the liquid level, forming a water seal and no steam leakage, resulting in good energy savings. Minimum working pressure is 0.01 MPa, and continuous drainage is possible from 0.01 MPa to the maximum operating pressure range, regardless of temperature and operating pressure fluctuations. Can discharge saturated temperature condensate, the minimum subcooling degree is 0℃, no water is stored in the heating equipment, which can make the heating equipment achieve the best heat exchange efficiency. The back pressure rate is greater than 85%, making it one of the most ideal traps for production process heating equipment.
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2、Free semi-float trap.
The free semi-float trap has only one semi-float bucket as a moving part, with the opening facing downward, and the bucket is the opening and closing member and the sealing member. The entire spherical surface can be sealed for a long service life, and it is resistant to water strikes, has no wearing parts, is trouble-free, durable, and has no steam leakage. Back pressure rate is more than 80%, can discharge saturation temperature condensate, the minimum subcooling degree is 0℃, no water stored in the heating equipment, can make the heating equipment to achieve the best heat exchange efficiency.
When the device is first started, air and low-temperature condensate in the pipeline enter the trap through the launch tube, and the bimetal evacuation element in the valve pops the ball bucket open, the valve opens, and air and low-temperature condensate are quickly discharged. When steam enters the bucket, the bucket becomes buoyant upward, and the temperature inside the valve rises, the bimetal evacuation element contracts, the bucket drifts toward the valve opening, and the valve closes. When the steam inside the bucket becomes condensate, the bucket loses buoyancy and sinks downward, the valve opens and the condensate is rapidly discharged. When steam re-enters within the ball bucket, the valve closes again, working intermittently and continuously.
3、Lever Float® Trap.
The basic characteristics of lever float type traps are the same as free float type, and the internal structure is that the float is connected to the lever to drive the spool, and the valve is opened and closed with the rise and fall of the condensate level. The lever float trap uses a double seat to increase the condensate discharge volume, which can achieve a small volume and a large discharge capacity of up to 100 tons per hour, making it the ideal trap for large heating equipment.
4、Inverted bucket trap.
Inside the inverted bucket trap is an inverted bucket as a level-sensitive part, with the bucket opening downward and the inverted bucket connecting lever driving the spool to open and close the valve. The inverted bucket trap can discharge air, is not afraid of water strike, and has good anti-fouling performance. The subcooling degree is small, the steam leakage rate is less than 3%, the maximum back pressure rate is 75%, there are more connections, and the sensitivity is not as good as that of the free float trap. Because inverted bucket traps rely on the upward buoyancy of steam to close the valve, they are not suitable for use when the operating differential pressure is less than 0.1 MPA.
When the device is first started, the air and low-temperature condensate in the piping enters the trap, the inverted bucket drops by its own weight, and the inverted bucket connection lever drives the spool to open the valve, and the air and low-temperature condensate are quickly discharged. When steam enters the inverted bucket, the steam in the inverted bucket generates upward buoyancy, and the inverted bucket rises to connect the lever to drive the spool to close the valve. A small hole is opened in the inverted bucket. When a part of the steam is discharged from the small hole, another part of the steam generates condensate, and the inverted bucket loses buoyancy and sinks downward by its own weight.
5、Combined superheated steam trap.
Combination superheated steam trap has two isolated valve cavities, connected by two stainless steel pipes to the upper and lower valve cavities. It is a combination of float type and inverted bucket type trap, which has advanced and reasonable structure, and can timely discharge condensate formed when superheated steam disappears under superheated, high pressure and small load working conditions, effectively stopping superheated steam leakage and high working quality. The maximum allowable temperature is 600℃, the valve body is all stainless steel, the valve seat is hard alloy steel, and the service life is long. It is a special trap for superheated steam and has obtained two national patents, filling the gap in China.
When condensate enters the lower valve cavity, the float of the subvalve rises with the liquid level and the float closes the inlet pipe hole. Condensate rises to the main valve cavity through the inlet conduit, and the inverted bucket drops by its own weight, driving the spool to open the main valve and discharge condensate. When the condensate level in the secondary valve cavity drops, the float drops with the liquid level and the secondary valve opens. Steam from the steam inlet pipe into the upper main valve cavity in the inverted bucket, the inverted bucket to produce upward buoyancy, the inverted bucket drive the spool to close the main valve. When the condensate level in the secondary valve cavity rises again, the next cycle begins again with intermittent drainage.
