. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ftydrai///c Pressure/or Grinder Fig. 46. A reducing valve may be placed adjacent to valve F, if the pres-sure due to the head is too high. When the reducing valve is set,constant-pressure water is supplied to the grinders. 112. Hydraulic-Accumulator System.—This system, shown inFig. 47, involves considerable equipment, and is therefore expen-sive to maintain; it is quite commonly found in the old types ofpulp mills. Filtered water is supplied from clear well D, and is drawn intothe triplex hydraulic pump G
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. ftydrai///c Pressure/or Grinder Fig. 46. A reducing valve may be placed adjacent to valve F, if the pres-sure due to the head is too high. When the reducing valve is set,constant-pressure water is supplied to the grinders. 112. Hydraulic-Accumulator System.—This system, shown inFig. 47, involves considerable equipment, and is therefore expen-sive to maintain; it is quite commonly found in the old types ofpulp mills. Filtered water is supplied from clear well D, and is drawn intothe triplex hydraulic pump G through a control valve F and suc-tion line E. The pump delivers water to the bottom of the hy-draulic-accumulator cylinder L by means of pipe H and throughvalve J. The pressure on the discharge side of pump G isgoverned by the weight M supported by the hydraulic-accumula- 92 MANUFACTURE OF MECHANICAL PULP §3 tor ram or piston N. The pressure in supply line 0 to grindersP may be varied by putting on (or taking off) weights on top ofM. The object of the hydraulic accumulator is to
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