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Type N201

D450003T012

Instruction Manual

MCK-1023

May 1980

Type N201 automatic cylinder filling valve is supplied 

completely piped up, and consists of a filler valve assembly, 

two Type 67 regulators with pressure gauges, a trip valve, 
and special parts for alternate scale installations. 

 

 

Refer to Figure 1.  Supply pressure registers at 

regulators 1 and 2.  Pressure from regulator 1 registers 

beneath the lower diaphragm of the filler valve, see “A” 

in Figure 1.  This pressure holds the lower valve closed, 

preventing pressure from regulator 2 from registering on 

the upper diaphragm.  Spring force holds the upper valve 

open, and liquid from the charging pump can enter the 

cylinder to be filled. 

When the cylinder reaches the predetermined weight set on 

the scale, the beam button on the scale beam contacts the 

trip valve, see “B” in Figure 1.  The trip valve opens to exhaust 

pressure from under the lower diaphragm.  Spring force opens 

the lower valve, allowing pressure from regulator 2 to register 

on the upper diaphragm.  This closes the upper valve, and 

stops flow through the orifice.  A red button indicates that the 

filler valve is closed and that the cylinder is full.  Removing the 

full cylinder from the scale closes the trip valve and permits 
the system to reset itself for the next cylinder.

Refer to Figure 2.  

 

  1.  Connect the top 1/2-inch FNPT connection “C” of the 

filler valve to the charging manifold.   
  2.  Determine if the trip valve hose is long enough to reach 

the scale frame as shown.  If not, insert 1/8-inch pipe 

as needed.
  3.  Standard trip valve installation (also see alternate 
methods, 3.A and 3.B):

 

 

 

a.  The trip valve should be installed at approximately 1/5 

of the scale beam length, measured from the pivot point to 

the beam stop, see drawing.  Although the trip valve can 

be installed to operate directly off the scale beam, it is not 

recommended because of the side play in most scale beams 

can resuIt in failure to contact the trip valve.    
  b.  Drill a 5/8-inch (16 mm) hole through the scale frame 

directly above the point on the scale beam, determined in 

step 3 (a).  

 

  c.  Remove locknut “D” and insert trip valve through the 

5/8-inch (16 mm) hole.  Replace locknut.  

 

  d.  Place beam button “J” on the scale beam directly 

beneath the trip valve.  

 

  e.  Using locknuts “D” and “E”, position trip valve stem “B” 

so that it barely contacts beam button “J” with the scale 

beam in a level position, see drawing.