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Idiomas disponibles
Idiomas disponibles
Direct action pressure
reducing valve
Model 614
Operation
The operation of the reducing valve is based on the principle of direct action. The
force exerted by the spring displaces the axle and maintains the locking ball open.
The fluid exerts an opposite force on the hood as it passes, which tends to reduce
the section of passage of the fluid through the seating. The action of the spring
and reaction of the pressure on the bellows balance each other, and the reduced
pressure is maintained constant.
The fluctuations in consumption affect the reduced pressure. The bellows detects
these variations via the balance hole, provoking a change in the passage of fluid
as a function of the established reduced pressure.
In working conditions with zero consumption, the valve remains closed and
completely airtight when there is a slight increase in reduced pressure.
Installation
— Allways install the valve in a section of horizontal tubing, as close as possible to the
point of consumption.
— The valve may be assembled in any position, even upside-down.
— Verify that the fluid flows in the direction indicated by the arrow on the body of the
valve.
Area of influence of input
— The input and output tubes must be of the correct size and properly supported, to
pressure. (P
)
1
avoid any fall in pressure or tension.
— The output tubing should ideally have a greater diameter than the input tubing, to
Area of influence of reduced
avoid excessive velocity of flow of the liquid.
pressure. (P
)
2
— In accordance with the requirements of "Regulations for pressure devices ITC-MIE-
AP 2 5.8", the pressure reduction facilities in steam circuits will besupplied with:
1- A pressure gauge with syphon tube and three end cock, in accordance with article
11 of the MIE-AP 1 instructions, "Boilers", located before and after the reduction valve.
2- A safety valve following the reduction valve, capable of evacuating the maximum
flow of steam, which permits flow at the level regulated and adjusted to the maximum
reduced pressure of service plus a maximum of 10%.
Example of installation for steam
6
9
5
4
1
2.2
7
2.3
3
2.1
10 11
3
IMPORTANT
— The distance between the pressure reducing valve
7
and the interruption valves
diameter of the tube.
— It is advisable to install the separator
1
and the condensate purger
— We recommend that the reduction device be equipped with a by-pass and interruption valve with an adjusting cone
Condensate separator.
1
Interruption valve.
2
Filter.
3
8
Syphon tube.
6
4
5
Pressure gauge cock.
5
4
Pressure gauge.
6
Pressure reducing valve.
7
2.4
Safety valve.
8
Interruption valve with
9
adjusting cone.
Condensate purger.
10
11
Window sight glasses.
2.2
and
2.3
must be 8 ÷ 10 times the
10
using wet steam with dragging.
9
.
Start-up and adjustment of the reduced pressure
1- Before start-up, the tubes and the inside of the valve itself should
be cleaned, eliminating any residues or impurities, particularly
from the locking surfaces.
2- Check the rating plate (37) to verify that the regulation field for
the reduced pressure is appropriate and that the spring (27) co-
rresponds to the same range.
3- Remove the nut (38), the rating plate (37) and the anchoring
bolt (36).
A-A ( 14 : 20 )
4- With the input interruption valve fully open and the output inte-
rruption valve closed, turn the handwheel (34) gradually from
left to right to increase the reduced pressure, or from right to left
to decrease it, until the required reduced pressure is obtained at
zero consumption.
5- Slowly open the output interruption valve.
6- Readjust the required reduced pressure in consumption condi-
B
A
A
tions.
7- Put the anchoring bolt (36) and the rating (37) in place, and fix
with the nut (38).
8- Seal the valve to prevent further adjustments, using the sealing
wire (33) and the seal (3).
9- We recommend that the input pressure P1 and the reduced
pressure P2 be recorded in the corresponding space of the ra-
ting plate (37).
3
35
38
37
39
34
36
33
30
32
31
15
21
14
19
16
17
11
10
5
31
32
4
6
9
8
7
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119
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Disassembly and assembly
1- Unseal the valve by cutting the thread (33).
2- Remove the nut (38), type plate (37) and locking pin (36)
3- Turn the handwheel (34) from right to left until you feel the
spring relax (27)
4- Unscrew the bolts (32) and remove them together with the
washers (31).
5- Detach the cover (30) from the body (1) and you will gain
access to some internal components. This facilitates easy
maintenance or replacement of the spring (27), and the
bellows (24) (25) (26).
6- Remove the bellows (16), (17), (18), (19), (20) and (21). This
allows us to clean the filter (14).
7- Turn the valve and unscrew the bolts (32) and remove them.
8- Detach the cover (4) from the body (1) and you will gain access
to some internal components. This allows us to easily maintain
B
or replace the spring (7), components (12), (9) and (6) and the
seat (2).
9- If the valve has been disassembled, replace the seals (22),
B-B ( 1 : 2 )
(15) and (5) with new ones.
10- Insert the guide (9) and the spring (7) with the plug (12) and
fix it with the cover (4) and the guide bush (6)
11- Place the cover (4) on the body (1) and screw in the bolts (32)
after placing the washers (31).
12- Fit the filter (14) and thread the bellows (16), (17), (18), (19),
(20) and (21).
13- Insert the regulating bolt (23) and the bellows (24), (25) and
(26)
23
14- Select the appropriate spring (27) according to the reduced
28
pressure.
29
15- Place the cover (30) on the body (1), place the bolts (32)
together with the washers (31) and screw them in.
27
16- Finally, proceed according to the section "Commissioning
26
and adjustment of the reduced pressure".
22
Maintenance
25
20
A correct installation with inlet and outlet stop valves facilitates
maintenance.
24
The filter (14) should be cleaned periodically.
1
When accessing the valve assembly, replace the seals (22), (15)
and (5) with new ones.
13
2
12
Informative brochure, without obligation and subject to our General Sales Conditions.
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