June 1, 1917.] 



THE INDIA RUBBER WORLD 



513 



Fig 4. Anderson Trap. 



from the bucket into a tank from which it is pumped back to the 

 boiler. This trap will discharge the water twice as many feet 

 higher than the trap as there are pounds of steam pressure at the 



trap. 



In the Stickles bucket 

 trap, shown in Fig. 3, the 

 water enters the inlet A 

 through the chamber B, 

 which contains four ports C 

 leading into the trap proper. 

 As the four ports are at the 

 top of the chamber even 

 with the top of the bucket, 

 it is possible to maintain the 

 water surrounding it at the 

 full height of the bucket. 

 The discharge of water into 

 the trap when it is in operation, or open, is across the top of the 

 bucket line. This action prevents water that floats in the bucket 

 from being blown out. 



Water and steam upon entering the trap come in contact 

 with a baffle or separating ring D which throws the water down- 

 ward and the steam upward, the steam entering the upper port 

 F. Thus the steam and water are separated as they enter the 

 trap while the discharge is taking place and water is discharged 

 instead of steam and water. 



The water passes out through the large pipe G in the direc- 

 tion of the arrows, but sufficient water is left in the bucket when 

 the valve closes to form a water seal, and steam will not blow 

 out at the end of the discharge. The force of the water on the 

 wings of the valve when it is discharging assists in closing the 

 valve quickly. 



The valve rod, 

 made with a flexible 

 joint, connects the 

 valve with the bucket, 

 the flexible joint al- 

 lowing the valve to 

 seat squarely. When 

 large volumes of 

 water are to be 

 handled the trap i< 

 fitted with doubh- 

 -ported valves. 



FLOAT TRAPS. 

 Vacuum chamber 

 dryers, vacuum rotary dryers and fabric dryers used by rubber 

 manufacturers and reclaimers for drying rubber and fabrics 

 are generally equipped with float traps. It is necessary to have 

 an individual trap on the steam line from each separate dryer ; 

 otherwise there will be back-presssure and the condensation will 

 not drain properly : moreover, a float trap which has a greater 

 capacity than is actually needed in order to take care of any 

 variation, is usually specified. 



The Anderson trap shown in Fig. 4 is a typical float trap, and 

 its operation, briefly described, is as follows : 



The condensed water enters the trap at the jioint marked 

 "Inlet" and when sufficient has accumulated to seal the valve 

 with at least three or more inches of water, the float then rises 

 and opens the valve, allowing the condensed water to escape at 

 just the right rate to take care of the amount entering the trap, 

 thus maintaining a water seal at all times. 



The trap may he connected to several dryers with good re- 

 sults, provided a uniform steam pressure is maintained at all 

 times. It is always advisable when making up a connection of 

 this kind to run the several drips into a large header and attach 



Uu 



\\".\TSox & McD,\.\[Ki. Trat 



Davis Trap. 



the trap to the header, which has the effect of equalizing the 

 pressure to a certain degree and produces better results. 



When the pressure varies to any extent in the dryers the one 

 having the highest pressure will discharge freely and back up 

 into those having a lower pressure, and the best results can be 

 obtained only by attaching separate traps to those having lower 

 pressure. 



After the trap has been in use a short time it . is advisable, 

 especially on new piping, to unscrew the sediment strainer and 



remove the 



accumulation 

 of scale and 

 chips. 



In the sec- 

 tional view of 

 the Watson & 

 M c D a n i e 1 

 trap, shown 

 in Fig. S, the 

 water is dis- 

 charged as 

 fast as it 

 reaches the 

 trap. It has a 

 large valve 



outlet at the bottom, the valve of which is operated by a copper 

 float. 



The water of condensation enters the trap^through the inlet A. 

 The valve disk seats against B on the under side, and against 

 the pressure in the trap, and being away from the bottom of 

 the trap does not choke up with sediment. The valve stem C 

 is operated by the float D, and as the water rises in the trap 

 body the float lifts, moving the valve disk away from its seat, 

 when the steam pressure on the water will force the water out 

 of the trap body through the valve seat B and out of the dis- 

 charge outlet E. As the valve is practically balanced the weight 

 of the float is sufficient to overcome the pressure on the valve. 

 Another trap that operates on the same principle as the fore- 

 going, and is il- 

 lustrated in Fig. 

 6, is the Davis 

 trap. It is, how- 

 ever, equipped 

 with double 

 cone-shaped bal- 

 anced valves, 

 which are op- 

 erated by a cop- 

 per float. The 

 valves are al- 

 ways sealed by 

 water which 

 prevents leak- 

 age of steam 

 when the trap 

 i s dischar.ging. 

 As the valves 

 are balanced 



the trap operates equally well under high, medium or low pres- 

 sure without adjustment. As there are two valves, the trap is 

 of twice the capacity of a single valve trap having the same 

 valve area of one valve. The valves arc cone-shaped and do not 

 readily stick. 



The water of condensation enters the inlet A, and as the water 

 increases in height in the body of the trap the float lifts, carry- 

 ing the lever B with it, which in turn moves the rocker arm C 

 and forces the val\c D down and the valve E up from the seat. 



Fii;. 7. Dktroit Trap. 



