Emerson Fisher N201 Series Instruction Manual

Instruction Manual
MCK-1023
March 2009
Type n201 automatic Cylinder Filling Valve
Warning
!
install, use, and maintain this equipment
according to manufacturer's instructions
and all federal, state, local laws and
codes, and nFPa Pamphlet 58. Periodic
inspection and maintenance is essential.

introduction

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.

Principle of Operation

Refer to Figure 2. 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 2. 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 2. 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.
P1090

installation

Refer to Figure 3.
1. Connect the top 1/2 FNPT connection "C" of
2. Determine if the trip valve hose is long enough to
3. Standard trip valve installation (also see alternate
www.emersonprocess.com/regulators/lp
Figure 1. Type N201 Automatic Cylinder Filling Valve
the filler valve to the charging manifold.
reach the scale frame as shown. If not, insert
1/8-inch (3,2 mm) pipe as needed.
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. 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.
Type N201