138 BULLETIN 173, U. S. NATIONAL MUSEUM 



FROST STEAM-PUMP VALVE, 1890 

 Pi^TE 29, Figure 2 



U.S.N.M. no. 308718 ; original patent model ; transferred from the United States 

 Patent Office; photograph no. 32644B. 



This model was submitted with the application for the patent 

 issued to Eichard L. Frost, of Battle Creek, Mich., February 11, 1890, 

 no. 421355. The patent was assigned to the Union Manufacturing 

 Co. of the same place. 



The model represents a section through the steam cylinder, piston, 

 and steam valve of a direct-connected steam water pump. The valve 

 is a steam-actuated piston valve so designed that an increase in the 

 exhaust pressure cannot act on the valve as to entirely close the live- 

 steam port and stop the engine. 



The valve is a piston slide valve that admits live steam at its ends 

 through a hollow section to the cylinder steam ports close to the 

 middle of the valve. The exhaust is to the center. Formed on the 

 ends of the piston valve are enlarged pistons v.-hich closely fit cylin- 

 ders provided for them. Ports in these cylinders are so connected 

 to the main cylinder ports and the main cylinder that pressure on one 

 end server practically to balance the valve, while pressure on the 

 other end actuates the valve. The main piston is relatively long and 

 has an annular depression between its two ends. The space thus 

 formed between the piston ends and the cylinder in combination with 

 ports in the cylinder acts to supply steam to the valve cylinder to 

 actuate the valve. 



MOORE STEAM PUMP, 1891 



U.S.N.M. no. 308717; original patent model; transferred from the United States 

 Patent Office; not illustrated. 



The model was submitted with the application for the patent issued 

 to Ila N. Moore, of Battle Creek, Mich., June 23, 1891, no. 451753. 



The feature of this pump power is a piston with steam ports in the 

 piston leading to the ends of the cylinder and a valve fitted to slide 

 on the elongated and reduced barrel of the spool-shaped piston con- 

 trolling the admission of steam through the steam ports. The object 

 is to provide a steam pump requiring no steam chest. Steam is ad- 

 mitted at the center of the cylinder through two short passages 

 connecting directly with the steam pipe. Exhaust is to a chamber 

 on the opposite side of the cylinder. A hollow tail rod, gland, and 

 housing form part of the exhaust passage. The piston valve, which 

 slides on the barrel of the piston, is actuated in part by the pressure 

 of the steam and in part by the motion of the piston. Packing rings 

 on the outside of the valve heads operate across the steam inlet ports 

 in the C3dinder wall and the lands between grooves in the bore of the 

 valve operate across the ports in the piston barrel. 



