Pump pressure limiting engine speed control

Abstract

A sprinkler system for a building includes an internal combustion engine which operates a water pump. The water pump in turn forces water through pipes to sprinkler heads. The engine is at least in part controlled by a throttle control mechanism which includes a spring biased piston which is moved in response to the output pressure of the pump. This prevents the pump from exceeding the rated capacity of the system components.

This has been a description of the present invention and the preferred mode of practicing the invention, however, the invention itself should only be defined by the appended claims wherein we claim:  
     
         1 . A building sprinkler system having a pump said pump activated by an internal combustion engine; 
 said engine having a throttle;    said throttle attached to a control said control responsive to the output pressure of said pump and adapted to reduce engine speed at a pre-determined pressure.    
     
     
         2 . The building sprinkler system claimed in  claim 1  wherein said control has a piston said piston is linked to said throttle wherein said piston moves in response to said output pressure.  
     
     
         3 . The sprinkler system claimed in  claim 2  wherein said piston is spring biased.  
     
     
         4 . The sprinkler system claimed in  claim 3  wherein said piston rides in a cylinder having an end wall; and 
 a spring located between said end wall and said piston urging said piston away from said end wall.  
 
     
     
         5 . The sprinkler system claimed in  claim 4  wherein said cylinder includes an end cap and wherein further comprising at least one shim between said cap and said spring.  
     
     
         6 . The sprinkler system claimed in  claim 2  wherein said piston includes a first cylindrical portion which rides in a cylindrical chamber wherein water from said pump is directed to said chamber and being effective to move said piston at said predetermined pressure.  
     
     
         7 . The sprinkler system claim in  claim 6  wherein said piston has a stop member wider than said cylindrical chamber.  
     
     
         8 . A sprinkler system having a series of components said components having a rated pressure capacity; 
 a pump connected to an internal combustion engine and having pressure capability which when combined with a system suction pressure exceeds said rated pressure of said components;    throttle control responsive to water pressure from said pump adapted to prevent said water pressure from said pump from exceeding the rated pressure of said components.    
     
     
         9 . The sprinkler system claimed in  claim 5  wherein said piston further rides in a cylindrical chamber having an end portion wherein said piston extends beyond said end portion and has a stop member having diameter greater than the diameter of said cylindrical chamber.