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Directions for use metric air operated needle valves
Type NV 5 - 70/100 - 4E - ATC
1. General safety and warning rules
Adherence to the specifications and observance of the instructions is paramount for correct functioning and has therefore definitely to be assured by the user.
Local environmental conditions should also be taken into account. The competent and tight make-up of this connection is directly dependent on the experience
of the user/technician. Care must be taken that all users/technicians are trained thoroughly in the competent and correct handling/assembly of these connections.
NOVASWISS high pressure components have been designed acc. to the normes and regulations for pressure vessels and AD files. If the components are ordered
in degreased conditions, make sure that no contamination happens during the mounting. If the components are being used in explosion proof environment make
sure to use only explosion proof tooling.
2. Functional description and correct use
NOVASWISS air operated needle valves serve up to 7'000bar for the pressure-tight blockage of media in either directions. Pressure levels exceeding 7'000bar
up to 10'000bar, the air operated needle valve shall be used only as a drain valve (see Fig.4).
No changes (e.g. mechanical alterations, welding, brazing, delete the markings, soldering etc.) may be made to the valve. Do not use
products which are damaged or have been subjected to high temperature (ex. in case of fire). If the valves are used for purposes other than
those intended, the manufacturer or vendor shall not be held liable for any resulting damage. Such risks shall be borne by the user alone.
3. Specifications
3.1 Valve
Table 1
NV5-70/100-4E -ATC
Pressure range at
0...7'000 bar
-50°C...+30°C
0...101'500 psi
0...5'460 bar
Pressure range at +30°C...+200°C
0...79'170 psi
Temperature range of the media
-50°C...+200°C
When using media that cause corrosion, mechanical changes (e.g. solid particles etc.), as well as
chemical destruction (e.g. H2So4, H2, O2 etc.) the user must take appropriate countermeasures (e.g.
Media (fluids)
explosion protection etc.) and if necessary examine and/or replace the parts regularly.
In the case of flammable, explosive and/or toxic media, the applicable statutory regulations must be
observed.
The air operated needle valves are designed predominately for static service duty.
Type of service
In the case of dynamic loading appropriate measures must be taken by the user.
Ambient temperature
-50°C...+65°C
3.2 Air operator
Table 2
-ATC (Air to close)
Max. working pressure
Actuating pressure
The optimal opeating pressure is indicated on the name plate of the air operator.
Medium
Use filtered air, without oil. Recommended micron rating of filter: max. 40mm
Temperature range of the compressed air
-15°C...+65°C
Air inlet
Vent filter
Ambient temperature
-25°C...+65°C
4. Installation
Table 3
①
Indicator
Mounting holes
②
Air operator
Ød [mm / inch]
6 / 0.24
③
Vent filter; thread G1/4"
H
[mm / inch]
10 / 0.39
④
Mounting holes
⑤
F
[mm / inch]
35 / 1.38
Pressure connections
⑥
Vent holes for the pressure connections
⑦
Gland for replaceable seat; NV5 - ... -
⑧
Fig. 1
Vent holes for the packing
⑨
Grub screw
⑩
Bonnet
⑪
Air inlet; thread G1/4"
Fig. 2
①
ATC
⑪
②
③
⑩
④
⑧
⑨
⑥
⑤
⑦
4.1 Installation of valve
1. Mount valve using mounting holes
2. Connect the air tubing with a suitable fitting on the air inlet
3. Check if the grub screw is tightened firmly.
4. Make sure that the vent holes are never obstructed!
5. When used in a explosion proof zone, remove air filter
tube.
Needle valve are bi-directional and can be installed in either position.
In applications with a high flow rate or as a discharge valve we recommend that the flow direction as per the Fig. 3 be selected:
Fig. 3
max. 10kbar
FLOW
0...10'000 bar
0...145'000 psi
0...7'800 bar
4.2 The following pressure connections are admissible: -4E / HP3/16"
0...113'000 psi
Fig. 4
⑬
⑫
right
1. Prior to assembly grease all threads with an approprate lubricant (e.g. molybdenum-sulfide-based) before assembly.
⑪
2. Slide the gland
over the tube.
⑫
3. Screw the collar
up to the end of the thread and unscrew back one full turn (left-hand thread).
⑪
4. Screw the gland
into the pressure connection and tighten down to the torque given in the table 4.
Make sure that the vent holes are never obstructed!
4 bar / 58 psi
Table 4
Pressure connection
G 1/4"
Pressure
G 1/4"
Tightening torque [Nm]
Tolerance nominal value
4.3 Flow chart for air operator
(not included in the delivery)
Fig. 5
ATC
⑪
© 05.2017 / Rev. 2 Copyright by NOVA Werke AG
④
. Valve can be mounted in any orientation.
⑪
.
③
. Exiting air must be conducted to a explosion free zone by means of a leek proof
max.
7kbar
wrong
-4E
HP3/16"
7'000 bar
10'000 bar
45
15
± 10 %
5. Operation
5.1 Operation ATC (Air To Close)
To open:
-Release the actuating pressure.
To close:
-Apply actuating pressure.
5.2 Warning
-
Opening too fast can cause pressure hammer in the system and consequential damage to connected equipment. Excessively fast opening is
therefore to be avoided.
-
Attention do not apply excessive actuating pressure to the air operator. Otherwise valve will be damaged!
-
Outside the temperature range 0°...+40°C, protective gloves have to be used.
-
If the high or medium pressure connections are to be subject to intense vibration, then the use of anti-vibration connections is required.
Order number according to NOVA-Catalogue.
-
Should the components be mounted against a flat surface, it must be assured that at least one vent hole on every port (and vent hole for the
⑧
packing
) is left uncovered. It is forbidden to cover or plug vent holes.
-
Only dry compressed air, free of oil or grease must be used.
-
If the actuator is used in a humidenvirement, it must be assured, that no humidity enters the actuator. Periodic checks for rust inside and
outside must be made to assure proper functioning.
-
The closing and opening times must be set by external chokes (not included in the supply). This is an important factor for life duration. Our
products are designed for a maximum service life of 10 years.
6. Disassembly
Check that there is no pressure left inside the valve and the air operator before disassembly!
To disassemble, proceed in reverse order to assembly.
7. Maintenance
7.1 Servicing
NOVASWISS NV 5-70/100-4E-ATC air operated needle valves must be checked periodically for leaks.
Should components need replacement, only original NOVASWISS spares must be used.
Heavy pre-compressed spring in the air operator! Do not loosen or remove screws! Danger of cap being ejected away with extremely
high force!
7.2 Repair
Repair work may only be performed according to the repair instructions by instructed technicians.
For example:
-Changing the replaceable seat
-Changing the packing and stem
7.3 Troubleshooting
Fault
Possible cause
-Control fault.
Valve does not close.
-Damage to seat and/or stem.
Valve does not open.
Control fault.
Media leakage at connection vent
-Incorrect fitting of connection.
⑥
hole
.
-Damage to conical faces.
-Packing gland loose.
Media leakage at packing vent
⑧
hole
.
-Damage to packing and/or stem.
-Seat inadequately tightened.
Medium escapes through vent hole
⑦
of gland
.
-Seat sealig surface damaged.
Table 5
Valves
7'000 / 10'000 bar
⑩
60
Bonnet
Ma [Nm]
⑦
60
Seat
Ma [Nm]
8. Disposal
At the end of its service life the valves are to be disposed in accordance with the national regulations.
Specifications are subject to change without notice.
NOVA WERKE AG
Vogelsangstr. 24
CH-8307 Effretikon
NV 5 - 70/100 - 4E - ATC
3 / 3
Switzerland
Remedy
-Check pneum. air system.
-Consult technician.
-Check pneum. air system.
-Fit the pressure connection correctly.
-Consult technician.
ATC:
-Release system pressure
-Release air pressure, to avoid pressure of lower stem on seat.
⑨
⑩
-Loose the grub screw
, tighten down the bonnet
to the torque given in the
⑨
table 5. Tighten the grub screw
.
-Consult technician.
-Release air pressure, to avoid pressure of lower stem on seat, tighten down seat
according table 5.
-Consult technician.
www.novaswiss.com
info@novaswiss.com
Tel: +41 (0) 52 354 16 16
Fax: +41 (0) 52 354 16 90
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