Installation Guide
Liquid level regulating valve
PMFH 80-500
027R9522
1 2
027R9522
PMFH + EVM
3 5
4
7
© Danfoss A/S (MWA), 2021-01 AN173386433040en-000401 | 1
6
Info for UK customers only:Danfoss Ltd. Oxford Road, UB9 4LH Denham, UK
Danfoss
M27F0006
8 9
A
B
C
Pos.
Item.
a 50
b 50
c 30
d 50
f 40 60 80
g 40 60 80
h 17 34 49
i 30
k 80 100 120
l 50 60 100 120
Tilspændingsmoment i Nm (10 Nm = 1 kpm)
Tightening torque in Nm (1 Nm = 0.74 lb force ft)
Anzugsmoment in Nm (10 Nm = 1 kpm)
Couple de serrage en Nm (10 Nm = 1 kgf.m)
PMFH Størrelse
Size
Größe
Dimension
80 125 200 300 500
Table 1
2 | AN173386433040en-000401 © Danfoss A/S (MWA), 2021-01
ENGLISH
Installation
Refrigerants
Applicable to HCFC, HFC and R717
(Ammonia).
Flammable hydrocarbons are not
recommended. The valve is only
recommended for use in closed circuits. For
further information please contact Danfoss.
Temperature range
PMFH: –60/+120°C (–76/+248°F)
Pressure range
PMFH: The valves are designed for a max.
working pressure of 28 bar g (406 psi g).
Technical data
PMFH can be used in suction, liquid, hotgas and liquid/vapour lines.
The PMFH regulates the flow of the
medium by two step on/off function,
depending on the control impulse from the
screwed-on pilot valves.
Design
See fig. 2
1. Valve body
1. a. Channel in valve body 1
10. Valve spindle
12. Valve plate
23. Spring
24. Servo piston
24. a. Channel in servo piston 24
30. Bottom cover
36. Drain plug
40. Cover
40. a. b. c. Channels in cover 40
44. Pressure gauge connection
60. Manual operating spindle
73. Pilot connection
100. Blanking plug
Installation
Flange set for the PMFH is delivered
separately. The valve must be installed
with the arrow in the direction of the flow
and the top cover upwards (fig. 1). The top
cover can be rotated 4 X 90° in relation to
the valve body.
The valve is fitted with a spindle for manual
opening.
When an external pilot valve is used, the
pilot line must be connected to the upper
side of the main line so that any dirt and oil
from the plant will not find its way into the
pilot line.
The PMFH valve can be controlled by the
SV float valve as shown on fig. 7. Please
refer to SV instruction guidelines.
The valve is designed to withstand a high
internal pressure. However, the piping
system should be designed to avoid liquid
traps and reduce the risk of hydraulic
pressure caused by thermal expansion. It
must be ensured that the valve is protected
from pressure transients like “liquid
hammer” in the system.
Mounting of valve flanges
When welding/soldering the flanges to
the system piping use only materials and
welding/soldering methods compatible
with the flange material.
• Make sure that piping into which a valve/
flange is installed is properly supported
and aligned square and plumb to the
joining sections.
• Ensure that the finalized valve assembly
is free of any stresses from external loads.
• Make certain that the heat affected
zones (inside and outside) and the
mating surfaces of gasketed joints are
free of debris and rust and are in good
condition.
• Use only new gaskets manufactured by
Danfoss.
• Make sure that the bolts are adequately
tightened in an alternating pattern.
• Use only original Danfoss stainless steel
bolts provided with the valve. Stainless
steel bolts offer corrosion protection
and they ensure safe operation across
the design operating range of the valve
when installed properly.
Note: Stainless steel bolts have a
slightly lower yield strength compared
to carbon steel bolts. Be careful not to
over-tighten the bolts.
• Ensure that flanges / valves are properly
pressure tested, leak tested, evacuated
before charging with refrigerant in
accordance with ANSI /IIAR 5, EN378-2 or
ISO 5149-2.
PMFH valves must not be mounted in
systems where the outlet side of the valve
is open to atmosphere. The outlet side of
the valve must always be connected to the
system or properly capped off, for example
with a welded-on end plate.
Colours and identification
The PMFH valves are Zinc-Chromated in
the factory. If further corrosion protection
is required, the valves can be painted.
Precise identification of the valve is made
via the ID plate on the top cover.
The external surface of the valve housing
must be prevented against corrosion
with a suitable protective coating after
installation and assembly.
Protection of the ID plate when repainting
the valve is recommended.
Maintenance
Service
The PMFH valves are easy to dismantle and
most of its parts are replaceable. When the
bottom cover is removed, the strainer can
be taken out for cleaning.
Do not open the valve while the valve is
still under pressure.
- Check that the O-ring or gaskets have
not been damaged.
- Check that the spindle is free of scratches
and impact marks.
- If the teflon ring has been damaged, the
parts must be replaced.
Assembly
Remove any dirt from the body before the
valve is assembled. Check that all channels
in the valve are not blocked with particles
or similar.
Tightening
Tightening torques
See fig. 8 and table 1.
Note:
Always pay attention to the spindle
during operation of the manual opener
(see fig 9)
1. Make sure that the C-clip (C) is
positioned on the spindle (B) and is
intact. A new C-clip is available in the
inspection kit for the valve.
2. Pay attention to the C-clip reaching the
top nut of the packing gland when
turning the manual stem clockwise for
opening the valve. Never use excessive
torque and stop turning when the
C-clip gets in contact with the top nut.
3. When turning the spindle (B)
anticlockwise, for deactivation of the
manual opener, to the top point, tighten
the spindle further anticlockwise to
8 Nm (5.9 lb/ft) torque.
4. Remount the cap (A) and tighten it
clockwise to 8 Nm (5.9 lb/ft) torque.
Use only original Danfoss parts, including
packing glands, O-rings and gaskets for
replacement. Materials of new parts are
certified for the relevant refrigerant.
In cases of doubt, please contact Danfoss.
Danfoss accepts no responsibility for
errors and omissions. Danfoss Industrial
Refrigeration reserves the right to make
changes to products and specifications
without prior notice.
The following text is applicable to the UL
listed products PMFH 80-500
Applicable to all common non-flammable
refrigerants, including/excluding (+)
R717 and to non-corrosive gases/
liquids dependent on sealing material
compatibility (++). The design pressure
shall not be less than the value outlined
in Sec. 9.2 of ANSI/ASHRAE 15 for the
refrigerant used in the system. (+++).
© Danfoss A/S (MWA), 2021-01 AN173386433040en-000401 | 3
4 | AN173386433040en-000401 © Danfoss A/S (MWA), 2021-01
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