Janus FM-200 Sv Series - Vent Check; Pilot Actuation Check Valve; NPT Style Pilot Actuation Check Valve; Pilot Actuation Adapter

Page: 20
FM-200® OPERATION, DESIGN, & SERVICE MANUAL
Revision F
Document # DOC102
Issued: February 1, 2009
Revised: 11-Nov-2011
40YE
2.3.2 Vent Check
P/N 10173 (See Figure 2.3.2)
e vent check is a safety device with 1/4 in (8 mm) male
NPT threads that is to be installed in the pilot actuation
line downstream of the pilot actuation check valve. It is
used to bleed o pressure that may accumulate in the
slave cylinder actuation piping, reducing the chance of
inadvertent operation of pneumatic valve actuators. A
rapid accumulation of actuation pressure will cause the nylon ball located inside the vent check to seat and
seal allowing the pneumatic valve actuators to operate as intended. After actuation, pressure must be bled
down from the pilot actuation line in order to unseat this nylon ball. is can be done by loosening a tting
along the pilot actuation line.
2.3.3 Pilot Actuation Check Valve
P/N 18560 (See Figure 2.3.3)
A 1/4 in (8 mm) MNPT by 37° male JIC check valve is
installed in the pilot actuation port of the primary cylinder
valve with direction of ow OUT of the valve. When the
valve opens, pressure will be directed through the pilot
actuation check valve to the pneumatic valve actuators
on the slave cylinders. e purpose of the pilot actuation
check valve is to ensure the pneumatic actuator(s) remain
pressurized for the entire discharge period.
2.3.4 NPT Style Pilot Actuation Check Valve
P/N 10262 (See Figure 2.3.4)
e NPT Style Pilot Actuation Check Valve is
recommended for pilot actuation line congurations
utilizing copper tubing or two-side pilot actuation
lines (refer to Sections 4.1.6.2 and 4.1.6.4) in place of
the standard Pilot Actuation Check Valve. It is a 1/4
in (8 mm) FNPT by MNPT check valve. An adapter
hex nipple (Sv Series P/N 18713; Mv and Lv Series
P/N 19192) is required to facilitate the installation of
the NPT Style Pilot Actuation Check Valve into the
pilot actuation port of the primary cylinder valve with
direction of ow OUT of the valve.
2.3.5 Pilot Actuation Adapter
P/N 18624 (See Figure 2.3.5)
A 3/8 in (10 mm) MNPT by 1/4 in (8 mm) FNPT
brass pipe bushing is tted into the pilot actuation
port of the Sv Series primary cylinder to facilitate the
attachment of the pilot actuation check valve. is
component is not required on the Mv or Lv Series
system.
Section 2 System Description and Components
Figure 2.3.3 Pilot Actuation Check Valve
2.50 in
63.5 mm
Figure 2.3.4 NPT Style Pilot Actuation Check Valve
2.50 in
63.5 mm
0.938 in
23.8 mm
Figure 2.3.5 Pilot Actuation Adapter
Figure 2.3.2 Vent Check
0.75 in
19.05 mm
0.56 in
14.22 mm