Emerson Yarway Integral Strainerimpulse 440, Yarway Integral Strainerimpulse 400, Yarway Integral Strainerimpulse 461, Yarway Integral Strainerimpulse 441, Yarway Integral Strainerimpulse 460 Instruction, Operation And Maintenance Manual

YARWAY SERIES 400 INTEGRAL STRAINERIMPULSE

®

InstructIon, operatIon and maIntenance manual

Before installation these instructions must be fully read and understood

RATINGS

Operating pressure ranges

MAX. TEMPERATURE (C)

SATURATION

CURVE

ALL
LIQUID
PHASE

ALL

SUPERHEAT

MAX. PRESSURE, psi

SERIES 460

SERIES 461

SERIES 441

MAX. TEMPERATURE (F)

BACK PRESSURE LIMITS

Piston valve traps rated to 400 psig (28 bar)
(incl.) are factory set to operate from 20
psig (1.4 bar) to maximum rated pressure.
Maximum allowable back pressure at trap
outlet equals 40% of pressure at trap inlet.
(Based on absolute pressure.)
Piston Valve traps rated to 600 psig (42 bar)
(incl.) are factory set to operate from 40
psig (2.8 bar) to 600 psig (42 bar). Maximum
allowable back pressure at trap outlet equals
25% of pressure at trap inlet. (Based on
absolute pressure.)
Note: the traps operate over the specified
ranges without adjustment.
Piston Valve Traps may be adjusted to operate
between 10 psig (.7 bar) and the minimums
stated above by removing the split washer (see
disassembly section.) Back pressures higher
than the percentages stated above will cause
the traps to blow open. Where normal system
back pressures are high, removal of the split
washer will also permit operation against back
pressures up to 55% of pressure at trap inlet.
(Based on absolute pressure.)

MAX. PRESSURE, bar

SERIES 440

Disc valve traps rated to 600 psig (42 bar) (incl.)
operate from 4 psig (.28 bar) to maximum rated
pressure. Maximum allowable back pressure
at trap outlet is 60% of pressure at trap inlet.
(Based on absolute pressure.)

SERIES NUMBERS

To determine the size, series number, and
pressure temperature rating refer to the
nameplate on the trap body.

VCIOM-09534-EN 18/09Emerson.com/FinalControl © 2018 Emerson. All Rights Reserved.

YARWAY SERIES 400 INTEGRAL STRAINERIMPULSE

InstructIon, operatIon and maIntenance manual

SUFFIX LETTER IDENTIFICATION

®

Rating
psig, °F)
(bar, °C)Piston Disc

400-975 (28-524)
400-775 (28-413)
600-975 (42-524)
600-775 (42-413)
400-975 (28-524)
400-775 (28-413)
600-975 (42-524)
600-775 (42-413)
400-975 (28-524)
400-775 (28-413)
600-975 (42-524)
600-775 (42-413)

Size end
connections

½" 440

¾" 440

1" 440

Figure

number

441
460
461

441
460
461

441
460
461

Internal parts

Available end

connections

A/B D SW, FL

SW

SW, FL

SW

A, B, C D SW, FL

SW

SW, FL

SW

A, B, C D SW, FL

SW

SW, FL

SW

SW Socket weld ends
FL Flanged ends (special option only)
A, B, C, D Internal part size
E Navy (Flanges per MIL-T-960E)
D Navy (Flanges per MIL-T-960D)

NOTES

1. 400 psi (28 bar) socket weld end traps are furnished for 300 psi (21 bar) and 150 psi (10.5 bar) ratings.

2. All flanged end traps are of chrome moly steel construction. Socket weld end traps in the series 440 or 460
are chrome moly steel construction. Series 441 and 461 socket weld end traps are constructed from carbon
steel.

WARNING

Hot discharge from this product may cause severe burns. Discharge must be piped away or directed so
that persons in the vicinity are not endangered. This product must be isolated, vented and cool to the
touch before repairing or inspecting.

2

YARWAY SERIES 400 INTEGRAL STRAINERIMPULSE

InstructIon, operatIon and maIntenance manual

®

INSTALLATION

Piping to and from the trap should be equal to

trap size or one size larger. Discharge line for
short runs equal to trap size; larger for long
runs. Avoid configurations that would cause
excessive back pressure.
Locate trap below outlet from equipment
(gravity flow). If trap must be above drain
provide a 'U' or lift fitting at the bottom of the
riser before the trap (water seal). The trap may
be installed in a horizontal or vertical line or at
any angle so long as the discharge is downward
or horizontal.
Valves - use gate type for isolating, globe type
for strainer blowdown, or for test (see Figure 1).
Bypasses not recommended except for critical
installations. If discharge is to a multistation
or overhead return, put a swing check valve
in discharge line to prevent backflooding on
shut-down.
Blow the system out before installing the trap.
Frequent strainer blowdown or cleaning is
recommended on a new system. Conditions
will dictate frequency of blowdown in normal
operation.

Welding - socket welding or seal welding
of this trap body to the piping should be
completed according to applicable Codes,
Standards and Procedures. DO NOT make
electrical welding connections to the trap body
or any other part of the trap to prevent internal
arcing. Electrical ground should be made to the
pipe and not the trap.
The standard body material for Series 400
traps is ASTMA182 GR F11, with controlled
carbon to .15% MAX. The trap is also available
in ASME SA-105 with Carbon controlled to .25%
max, manganese controlled to 1.25% max and
normalized. See underside of body for material
designation.

Note: it is not necessary to disassemble the
trap prior to welding, but avoid subjecting the
internals to temperatures higher than 500°F.

FIGURE 1

Equipment drain
Yarway Welbond shut off valve

Dirt leg
(optional)

Strainer blow-down (optional)
½ Yarway Welbond globe valve

Steam trap

Elevated return

Test valve (optional)
Yarway Welbond globe valve

Check valve

Return main

3