Needle valve E508 NGL

Needle valve E508 NGL

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NEEDLE VALVES
NEEDLE VALVES
PRODUCT FAMILY
PIPELINE PROTECTION
PIPELINE PROTECTION

Fields of application

The main characteristic of needle valve is the capacity to modulate water flow rate and elevated differential pressure. The needle valve NGL is able to do a linear manoeuvre also in a presence of relevant partialization degree although high inlet pressure and big exercise difference of pressure. The possibility to be actuated by electrical devices permit to use this valve in combination with control system to realize multiple function.

The needle valve controls the water flow rate through the axial movement of a shutter operated by a connecting-rod and crank mechanism. The inlet flow rate is channeled into a round section passage which gradually decreasing and then increasing from the intake to the sealing seat.

The internal profile of the valve is designed to optimize the hydrodynamic profile in order to have:

  • low head losses whit valve completely open
  • minimize cavitation phenomena in case of big differences between inlet and outlet pressures of valve. In this case the valve can be equipped with a special stainless steel cylinder for hydraulic loads dissipation

Range

The needle valve E508 NGL is proposed in standard versions:

  • Manual or motorized (with handwheel)
  • DN100 to 1000
  • Without anti-cavitation cylinder

Dimensions

Manual/motorizable Version

PN10

DNABGDEFLMNHCMass
mmmmmmmmmmmmmmmmmmmmmmmmkg
100117,530013412250235300140908016744
150150335134155403003501601109520071
20017040516918558340400170150115230103
250198440169218,553395450200170125263.5150
30022647016925053445500230200135295198
40029955717432050565600280240160382344
500363690303376100670700330316185438582
60042875030344080780800370320215530808
700492845308510858959004404402306001153
80055591030857080101510005005002506601486
900622101038464095111511005505502757302142
1000689107538471075123012006006003008002742
1200833124038486035148514007007003509884126
1400960139060910001451685160080080040011285677
1600108515755141100751930180090090045012337550

PN16

DNABGDEFLMNHCMass
mmmmmmmmmmmmmmmmmmmmmmmmkg
100117,530013412250235300140908016744
150150335134155403003501601109520071
20017040516918558340400170150115230102
250203440169218.553405450200170125263.5151
30023047217325070460500230200135295202
400299625303320120580600280240160382372
500363690303376100715700330316185438604
60042875030344080845800370320215530855
700492845308510859109004404402306001161
80055591030857080102510005005002506601490
900622101038464095112511005505502757302146
1000689107538471075125512006006003008002769
1200833124051486075148514007007003509884290
140096013905141000751685160080080040011285665
1600108515755141100751930180090090045012337550

PN25

DNABGDEFLMNHCMass
mmmmmmmmmmmmmmmmmmmmmmmmkg
100117,530013412250235300140908016743
150150365169155783003501601109520077
20018040516918558360400170150115230104
250213442174218.570425450200170125263.5158
30024347217425070485500230200135295207
400310625303320120620600280240160382385
500365690308376125730700330316185438616
600428750308440105845800370320215530859
700492845308510859609004404402306001201
800555910384570115108510005005002506601589
9006221010514640135118511005505502757302289
10006891075514710115132012006006003008003027

Motorized Version

PN10

DNABGDEFLMNHCMass
mmmmmmmmmmmmmmmmmmmmmmmmkg
100117.5398388122215235300140908016763
1501504333881552053003501601109520090
200170478413185198340400170150115230121
250198513413218.5193395450200170125263.5168
300226543413250193445500230200135295216
400299630420320208565600280240160382364
500363713547376190670700330316185438598
600428773547440170780800370320215530825
7004928685525101758959004404402306001170
800555933552570170101510005005002506601502
9006221033628640185111511005505502757302158
10006891098630710183123012006006003008002761
12008331263630860143148514007007003509884145
1400960141376010001831685160080080040011285698

PN16

PN25

Material and coating

ItemDescriptionMaterialCoating

1

Body

Ductile Iron GS 500-7

Epoxy powder 250µ mini – RAL 5005

2

Cover

AISI 304

3

Bush

Bronze CuSn12

4

O-ring

Elastomer EPDM

5

Shaft

AISI 420

6

Link Block

AISI 304

7

Shutter guides

Bronze CuSn8

8

Rod

AISI 420

9

Shutter

AISI 304

10

Fork

AISI 304

11

Retaining Ring

AISI 304

12

O-ring

NBR

13

Sealing Ring

PTFE - Carbographite

14

Gasket

NBR

Anti-cavitation cylinder

AISI 304

Internal ScrewsAISI 304
External ScrewsAISI 304

Gearbox and actuator characteristics

Main features gearbox:

  • Non-reversible worm gearbox
  • Manufacturer: AUMA / Germany
  • Material: Cast iron GG25 according to DIN 1693
  • External grey coating: 60 microns thickness, primer and spray coating
  • Open-close shutter position indicator
  • Enclosure IP68.3 according to EN60529
  • Actuation flange ready for optional further fitting of an electric actuator
  • Handwheel (for manual version): steel - epoxy coated with 150 microns DFT - direction arrows and words OPEN/SHUT stamped

Main features actuator:

  • 3 phases/ 400 V/ 50 Hz squirrel cage AC motor
  • Manufacturer: AUMA / Germany
  • Modulating service S4 -25% according to CEI / IEC standards
  • 2 end-stops switches tandem type
  • 2 torque limit switches
  • Heater in switch compartment (5-20 W)
  • Engageable emergency handwheel
  • Electronic position transmitter 4-20 mA
  • Enclosure IP67 according to EN60529

On request, it is also possible to configure differently the actuator (f.e. limit switches tandem type, enclosure IP68, etc..) and/or install an integral control unit. The gearbox of manual version valve is equipped with flange for electrical actuator mounting. Below the summary table showing the dimensional and operating features of gearing and electric actuators installed on the valves.

Table: Gearbox & actuator characteristics

DNPNGearbox AUMA typeNumber of turnsOperating torqueAUMA actuatorSpeedClosing time
mmNmrpms
10016GS 50.3 - F106.59SAR 07.62218
10025GS 50.3 - F106.514SAR 07.62218
10040GS 63.3 - F106.523SAR 07.62218
15016GS 50.3 - F107.516SAR 07.61628
15025GS 63.3 - F127.524SAR 07.61628
15040GS 63.3 - F127.538SAR 07.61628
20010GS 63.3 - F129.514SAR 07.61636
20016GS 63.3 - F129.522SAR 07.61636
20025GS 63.3 - F129.533SAR 07.61636
25010GS 63.3 - F1210.022SAR 07.61154
25016GS 63.3 - F1210.033SAR 07.61154
25025GS 80.3 - F1210.447SAR 07.61156
30010GS 63.3 - F129.131SAR 07.61150
30016GS 80.3 - F129.544SAR 07.61152
30025GS 80.3 - F129.567SAR 10.21152
40010GS 80.3 - F149.053SAR 10.2867
40016GS 100.3/VZ4.3 - F1435.321SAR 07.63266
40025GS 100.3/VZ4.3 - F1435.333SAR 07.63266
50010GS 100.3/VZ4.3 - F1634.921SAR 07.62295
50016GS 100.3/VZ4.3 - F1634.933SAR 07.62295
50025GS 125.3/VZ4.3 - F1634.950SAR 10.22295
60010GS 100.3/VZ4.3 - F1638.419SAR 07.622105
60016GS 100.3/VZ4.3 - F1638.430SAR 07.622105
60025GS 125.3/VZ4.3 - F1638.444SAR 07.622105
70010GS 125.3/VZ4.3 - F2536.033SAR 07.616135
70016GS 125.3/VZ4.3 - F2536.050SAR 10.216135
70025GS 125.3/VZ4.3 - F2536.077SAR 10.216135
80010GS 125.3/VZ4.3 - F2535.260SAR 07.616132
80016GS 125.3/VZ4.3 - F2535.2120SAR 10.216132
80025GS 160.3/GZ 8:1 - F2574.8120SAR 10.232140
90010GS 160.3/GZ 8:1 - F3072.960SAR 07.622199
90016GS 160.3/GZ 8:1 - F3072.9120SAR 10.222199
90025GS 200.3/GZ 16:1 - F30142.5120SAR 10.245190
100010GS 160.3/GZ 8:1 - F3073.947SAR 10.222201
100016GS 160.3/GZ 8:1 - F3073.973SAR 10.222201
100025GS 200.3/GZ 16:1 - F30144.464SAR 10.245193
120010GS 160.3/GZ 8:1 - F3076.758SAR 10.216288
120016GS 200.3/GZ 16:1 - F30149.052SAR 10.232281
140010GS 200.3/GZ 16:1 - F35149.051SAR 10.232279
140016GS 200.3/GZ 16:1 - F35149.078SAR 10.232279
160010GS 200.3/GZ 16:1 - F35149.078SAR 10.232279
160016GS 250.3/GZ 16:1 - F35146.2104SAR 14.232274

Performances and Standards

Hydraulic test

Every single needle valve is subjected to hydraulic final test in according to EN12266 and EN1074:

  • Body test at Ptest = max (1,5·PN ; PEA) (opened valve)
  • Seat test at Ptest = max (1,1·PN ; PEA) (closed valve)

Product test

Control of coating: thickness control, holiday test, impact test, MIBK test.

Conformity to Standards

Plan test:

  • EN 12266
  • EN 1074

Flange drilling:

  • EN 1092-2
  • ISO 7005-2
  • Face to face EN-558-1 Serie 15

Control devices connection:

  • ISO 5211 for valve-gearbox
  • ISO 5210 for gearbox-actuator

Suitability for potable water:

  • D.M. 174/04 for applicable parts (ex C.M. 102 of 02/12/1978)
  • Foreign conformity: KTW (Germany), WRC (U.K.), ACS (France)

Valve selection

For the right dimensioning and functioning and it is necessary to know the followings hydraulic parameters:

  • Hydrostatic downstream pressure (that is the upstream pressure with closed valve)
  • Upstream pressure Pin and downstream pressure Pout with maximum flow rate Qmax
  • Upstream pressure Pin and downstream pressure Poutwith minimum flow rate Qmin

Moreover it’s necessary to verify that the maximum speed in the valve have to be equal or inferior to 5m/s and the temperature have to stay between 0°C and 40 °C.

With this parameters is possible to size correctly the valve and evaluate if is necessary to use the anticavitation cylinder, consulting the Technical-Commercial SG PAM department.

Hydraulic features

For the calculation of head loss is possible to use the following expression:

∆h = ζ.v² 2.g

in which: Δh = head loss (m.c.a.), ζ = head loss coefficient (adimensional – from diagram 1), v = nominal speed (m/s), g = gravity acceleration 9,81 (m/s2)

After it’s possible determinate the flow rate Q (m3/h) in this way:

Q = ∆h 10.2 Kv

with Kv = flow rate coefficient (from diagram 2). It correspond to the flow rate in m3/h at 20°C that will cause a pressure drop of 1 m of column of water (10,2 corrective factor in meters).

Cavitation

To estimate the risk of cavitation it’s possible to use the following diagram. In order to verify if the valve are working in cavitation condition it is necessary to determinate the cavitation index σ by means the following formula:

σ = P out + P v + P a P in - P out + V² 2.9,81

with: P

out

= dynamic outlet pressure (m.c.a.), P

in

= dynamic intlet pressure (m.c.a.) , P

a

= absolute pressure (~ 10m)

The following diagram shows the critical cavitation index in relation to grade of opening for each typology (standard, anti-cavitation cylinder K20, K50, K100, K150). The value of cavitazione index σ should be about 25% above to the critical ones. The opening degree is calculated as showed in Par.4.1.

Marking

On the body according to EN19:

  • Nominal diameter in mm (DN)
  • Nominal pressure in bar (PN)
  • Type of ductile iron
  • Manufacturer’s logo
  • Flow direction
  • Model code
  • Fusion date.

On the label according to EN19:

  • Nominal diameter in mm (DN)
  • Nominal pressure in bar (PN)
  • Maximum allowable pressure (PFA)
  • Closing diraction
  • Product code
  • Ordination number and confirmation
  • Manufacturer’s logo.

Instruction for use

Storage

The needle valve will have to be held (if possible) in covered places, the most possible protected from the sun (maximum temperature 70°C) and from the rain and generally from the atmospheric agents. Moreover it will have to be avoided that the seal of the same air valves come to contact with powder or earth.

Installation

Had to be respected the direction of flow rate marked in fusion on the body of valve. Reverse flow can be accepted only with complete open valve without any necessity of regulation. It’s better to insert a dismounting joint to facilitate all the operation of installation and maintenance. For detailed information see Operation and Maintenance Manual.

Maintenance

Any maintenance operation requested had to be made only when the system has been emptied completely, in order to avoid any accident for the responsible operator. In order to keep this particularity, it is however necessary to operate the valve at least once a year, for a total cycle (opening/closing). For detailed information see Operation and Maintenance Manual.

Note

Saint-Gobain PAM reserves the right to modify the products anyway fully respecting the laws in force. Always use products fully complying with the European Directives to which the products themselves have to comply with.

FOR ANY FURTHER POSSIBLE TECHNICAL INFORMATION, PLEASE CONSULT SAINT-GOBAIN PAM.

Solutions