4
YarwaY
SERiES 400 intEgRAl StRAinERimpulSE
®
InstructIon, operatIon and maIntenance manual
dIsassEMBlY
piston valve type
1. Remove bonnet and unscrew seat.
2. the valve is larger in diameter than the
open end of the cylinder. to remove the
valve from the cylinder, push valve into back
of cylinder, squeeze open end of cylinder
lightly with pliers then tilt the valve out of
the cylinder.
3. inspect and clean all parts. if satisfactory,
reassemble trap. if internals require
replacing, remove cap nut and lock pin.
then using wrench and screw driver
simultaneously loosen control cylinder and
locknut. Remove split washer and unscrew
control cylinder. See page 6 for renewal kit
installation and assembly.
Note:
to reset trap for low pressure operation,
omit split washer when reassembling. tighten
locknut lightly against bonnet.
MaINtENaNCE
Check bonnet nut torque after 48 hours of
operation.
1. For best trap operation and maximum
service life, strainer screen should be
cleaned frequently. this can best be done by
using a blowdown valve connected to blow
off connection.
2. periodically remove the bonnet and clean
and inspect the screen. this should be done
at least once a year, and more frequently
if the trap is not fitted with a strainer
blowdown valve.
3. When cleaning the strainer it is
recommended that the trap be inspected
and working parts cleaned if necessary. in
the event of condensate drainage problems,
check before opening the trap whether
the trouble is due to a clogged line, valve
broken or in wrong position, or dirty strainer
requiring blowdown.
4. more frequent checks for proper trap
operation can be quickly made by one of the
following methods:
a. Observe the discharge from the trap
through the test connection - first
closing the downstream stop valve.
b. Hold screwdriver or metal rod against
base of cap. listen for characteristic
clicking sound of valve as it opens and
closes.
c. Check temperature of the cleaned pipe
surface upand downstream of trap.
use a touch pyrometer or temperature
sensitive crayon.
if trap is remaining open continuously or not
operating at all:
∙ strainer screen may be damaged or dirty
∙ parts may be worn from service
∙ dirt and scale may be lodged in internals
Disassemble and inspect the trap
parts lIst
Item
description
1
Body
2
Bonnet
3
Cap nut
4
Stud
5
nut
6*
Seat
7*
Control cylinder
8*
Valve
9*
Split washer
10*
locknut
11*
lock pin
12*
Cap gasket
13*
Bonnet gasket
14*
Seat gasket
15*
Screen
FiguRE 2
piston valve type
* Renewal kit parts for serias 460 and 461 traps only.
