XLC 470
10
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MPZ
– Altitude control pilot
The altitude control pilot is a diaphragm
operated valve, spring loaded and direct
acting, that can be installed basically in any
position. The function is to reduce and
stabilize the downstream pressure value
taken on the sensing port, regardless of flow
rate and upstream pressure fluctuations,
usually being the static pressure of the tank
to the maintained (installation details on
page 7).
Operation
The valve is normally opened thanks to the
force exerted by the spring over the
diaphragm, that is opposed to the static
pressure applied directly below it through the
sensing port (30) Should the latter exceed
the force of the spring the obturator (19) is
pushed up closing the passage through the
pilot (19), therefore leading the pressure
towards the main valve chamber to throttle
the flow, until the level inside the tank
(producing the static value sensed on the
pilot) had dropped due to the consumptions.
We obtain the regulation by acting on the
screw (04), after having removed the hood
(3) i.e. clockwise to increase the tank level
and
counter-clockwise
to
decrease
it
(regulation charts available on request
depending on the spring used for the
application).
Disassembly
It is not necessary to remove the pilot from
the circuit for the disassembly. Instead use
picture on the left, with the corresponding
components and materials, which indicates
the numbers specified here below to perform
the operations.
1- Remove the hood of the pilot (3) loosen
the tightening nut (5) and turn the lead
screw (4) anticlockwise, until the spring (7) is
completely unloaded
2- Remove the screws (14) separating the
upper part (15) from the lower part (16) (
6
11
26
9
24
3
7
5
14
30
20
22
19
17
10
25
2
4
16
23
21
1
29
15
13
12
8
18
28
27
N.
Component
Material
1
2
3
4
5
6
7
8
9
Body
Cover
Hood
Driving screw
Nut
Spring guide
Spring
Self-locking nut
Upper flat
Ni-plated bronze/st. steel
10
Diaphragm
Obturator holder
Sealing seat
Gasket holder
Plane gasket
18
19
20
21
Tap
O-ring
Screws
O-rings
Stainless steel
Neoprene
NBR
Stainless steel
NBR
Ni-plated bronze/st. steel
Stainless steel
Stainless steel
Stainless steel
Painted steel/st. steel
Stainless steel
Stainless steel
Stainless steel
Stainless steel
Stainless steel
NBR
Stainless steel
Stainless steel
Stainless steel
22
11
Diaphragm lower disk
12
O-ring
13
Shaft
14
O-ring
15
16
17
Upper flange
Lower flange
O-ring
Ni-plated brass/st. steel
Stainless steel
NBR
Stainless steel
NBR
Ni-plated brass/st. steel
NBR
23
24
25
26
27
Screws
Screws
Spare parts: 12-14-17-21-23-27
Pressure port
28
29
30
Inlet
Outlet
