275AP-SB13-01
1
275AP/APF SERIES HIGH-SIDE FLOAT VALVES
275AF SERIES LOW-SIDE FLOAT VALVES
BULLETIN 275AP-SB13-01
SERVICE BULLETIN
VALVES • VESSELS • SYSTEMS • CONTROLS
System drawings shown in this bulletin are for illustration purposes only. Refrigeration systems should only be serviced by a qualified technician.
Always observe proper safety procedures when servicing a refrigeration system. For more information see the latest reversion of Phillips Safety
Bulletin SGRV.
GENERAL INFORMATION
Pressure Rating:
300 psig (21 bar, gauge)
Maximum Operating
Pressure Differential:
275AF:
20 psi (1.4 bar)
275AP/APF:
250 psi
(
17 bar
)
Temperature Rating:
-20°F to 240°F
(-29°C to 116°C)
The 275AP/APF valves are high-side float valves which act as
pilot mechanisms for separate pilot-operated valves, such as
the Phillips 700H. The 275AP valve is used for ammonia
applications and the 275APF is used for halocarbon
applications.
The 275AF valves are low-side float valves that control
compressor crankcase oil level.
All the valves in this family open on a drop in liquid level and
throttle flow with a “needle and seat” mechanism. A 1/2” FPT
connection serves as an outlet connection for the 275AP/APF;
the same connection serves as an inlet for the 275AF.
INSTALLATION INSTRUCTIONS
The 275AF/AP/APF valves are available without a chamber
(Figure 1), with a cast iron chamber (Figure 2) or with a welded
steel chamber (Figure 3). An optional mounting flange is
available for mounting the valve without a chamber (Figure 4).
The valve should always be oriented such that the 1/2" FPT
connection is toward the top of the valve and the front face is
vertical. This will ensure that the float moves appropriately with
changes in liquid level.
The 275AP and APF valves are used as pilot float valves to
control a 700H series valve. The piping arrangement in Figure
5 shows a number of important details:
The float level should be at least 18 in. above the 700H
valve.
The pilot line MUST be
either 3/8” OD copper tubing
(halocarbon applications) or
1/4” nominal pipe (halocarbon
or ammonia).
The pilot line should include a shut-off valve, pressure
gauge and gauge valve for troubleshooting. (See
Troubleshooting section, later in this bulletin.)
Figure 1: 275AP/APF/AF Valve without Chamber
Ø4.50 [114.3]
Ø3.75 [Ø95.3]
BC
Ø0.50 [Ø12.7]
(6) HOLES
2-1/2" PIPE
X 2-1/2" LONG
2.42 [61.5]
1.20 [30.4]
VALVE
CL
F
L
A
N
G
E
F
A
C
E
9.13 [232.0] 275AP/AF
9.30 [236.2] 275APF
1.88 [47.6]
MOUNT 'G FLANGE, SEE FIGURE 4
1/2" FPT CONNECT ION
ABOVE VALVE CL
275AP/APF
275AF
0.56 [14.3]
VALVE
CL
FLOW DIRECT ION
Figure 2: 275AP/APF/AF Valve with Cast Iron Chamber
7.19 [182.6]
4.81 [122.2]
3/4" FPT
9.38 [238.1]
12.38 [314.3]
3/4" FPT
1/2" FPT
4.13 [104.8]
CHAMBER
Ø4.50 [Ø114.3]
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