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Figure 3: 275AP/APF/AF Valve with Steel Chamber
3/4" FPT
Figure 4:
Optional Mounting Flange
Ø2.91 x .34DP
SOCKET
Ø4.50 [114.3]
Figure 5: 275AP/APF Piloting 700H Valve
CONDENSER
UPPER EQ LINE
DRAIN
UNION
18 in.
MIN.
LOWER EQ LINE
(DO NOT TRAP
ON NH3)
Figure 6: 275AF Maintaining Oil Levels in Multiple
Compressor Crankcases
2 FT.
275AF: CHAMBER
EQUALIZED TO
CRANKCASE
275AP-SB13-01
3/4" FPT
LEVEL EYE
15.88 [403.2]
27.88 [708.0]
0.63 [15.9]
Ø3.75 [Ø95.3]
BC
(6) 7/16-20 NF
TO LOWER
PRESSURE
VESSEL
275AP/APF PILOT
FLOAT VALVE
PILOT LINE
1/4" NOMINAL IPS
P
700H SERIES
PILOT
OPERATED
VALVE WITH
CLOSE-COUPLED
STRAINER
MANUAL BYPASS
OIL RECEIVER / STILL:
AT LEAST 2 FT HIGHER
ELEVATION THAN CRANK
CASE FOR GRAVITY FEED;
CAN BE AT SAME ELEVATION
AS CRANKCASE IF AT HIGHER
PRESSURE.
275AF: CHAMBER
EQUALIZED TO
CRANKCASE
1/2" FPT
®
The 275AF valves may be used to maintain the oil level in one
or more compressor crankcases (Figure 6). Note that if the oil
reservoir level is less than 2 feet above the crankcase level, it
should be pressurized 5 to 20 psi (0.3 to 1.4 bar) higher than
the crankcase.
REPLACEMENT PARTS
Basic replacement parts are illustrated in Figure 7 and listed in
Table 1.
When contacting Phillips for replacement parts, have the
complete valve model and serial number (shown on the valve
nameplate) available to ensure you receive the correct
components. For example: "275APF-BZA" is a complete valve
model, and "990123" or "E-12345" are complete serial
numbers.
SERVICE INSTRUCTIONS
Lever pin / float block removal and replacement: If it is
necessary to remove the lever pin (411) and float block (230Z)
during servicing, first cut one end of the pin flush with the valve
body. Then either pull the pin out with pliers, or carefully drive it
out with a punch. Retain the spacers (11S) for re-assembly.
After re-assembly, peen the lever pin to retain in place and
check for free movement of valve components.
Needle and seat replacement: The needle and seat bushing
are lapped in the factory to create a matched set. If either the
needle or seat bushing show signs of wear or damage, both
parts must be replaced. To inspect or replace the needle and
seat perform the following steps.
1.
Remove the lever pin and float block as described above.
2.
Remove the old seat bushing and install a new one using
PTFE tape or other pipe sealant on the threads.
3.
Remove the old needle from the adjusting nut (204E), lock
washer (55), and lock nut (224). Reassemble the nut and
washer loosely on the new needle.
4.
Insert the new needle into the new bushing. Install the
float block / float assembly (without spacers) loosely in the
valve body with the lever pin. DO NOT PEEN THE LEVER PIN
AT THIS TIME.
(Continued on next page)
7.88 [200.0]
4.50 [114.2]
Ø6.63 [168.3]
8.25 [209.6]
2
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