TM 10-3930-653-14&P (c) Drawing out of Plunger (See Fig.  9-3.) With the neutral  passage  closed,  the  oil  pushes  up  the load  check  valve,  passing  through  the  parallel feeder,  and  flows  to  the  cylinder  port  "A".  The returning   oil   from   the   cylinder   port   "B"   flows through  the  low-pressure  passage  to  the  tank. The plunger is restored to the neutral position by the return spring. (2) Operation of Relief Valve The    relief    valve    is    located    between    the cylinder port "HP" and the low-pressure passage "LP".    The  oil  flows  through  the  poppet  "C"  and affects   the   two   areas   "A"   and   "B"   which   are different   in   diameter,   so   that   the   check   valve poppet  "K"  and  the  relief  valve  poppet  "D"  are securely seated.  (See Fig.  9-4.) When  the  pressure  in  the  cylinder  port  "HP" reaches  the  setting  pressure  of  the  pilot  poppet spring,   the   pilot   poppet   "E"   opens.      The   oil passes  around  the  poppet,  flowing  through  the drilled  hole  to  the  lowpressure  side  "LP".    (See Fig.  9-5.) As    the    pilot    poppet    "E"    is    opened,    the pressure behind the poppet  "C"  drops,  so that the   poppet   "C"   is   moved   to   seat   of   the   pilot poppet "E". As  a  result  of  this,  the  oil  flowing  behind  the relief valve poppet "D" is cut off and the pressure at the inner side is reduced.  (See Fig.  9-6.) As  compared  to  the  pressure  at  the  cylinder port   "HP"   side,   the   inner   pressure   becomes unbalanced,  causing  the  relief  valve  poppet  "D" to  open  and  thereby  sending  the  oil  directly  to the low-pressure passage "LP". (See Fig.  9-7.) Fig.  4-469. Fig.  4-470. Fig.  4-471. Fig.  4-472. Fig.  4-473. 4-237