Piston Needle Valve
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ADVANTAGES

 

L Efficiency:

Optimised flow performance and flow guiding with best hydraulic performance when fully     open for optimum energy efficiency and

savings.

L Precise flow control:

With a control range up to 96%the SUOTE

guarantee an optimal flow control thanks to     the mechanism of the SKG slider crank.More  than the optimisation of the regulation range   SKG slider crank allow a slow closing speed to avoid hammer shock risk.

L Prevent cavitation damage:

Thanks to a large control insert range from

standard to customised specially design to

localised cavitation in a non-risky area for the  engine.In addition to the 70+years experience and proven site operation,Erhard continuously conducts hydraulic tests and numerical fluid    simulations tofurther optimize cavitation

control.SUOTE confirm is expert position in the control of extreme application.

L Durability:

The different design choice such as at least 4  guiding,main gasket in cavitation free area or shaft protected from water stagnation,permit to guarantee long life of the valve.Long-

lasting,high-quality components and superior 250μm epoxy coating without any interruption  ensure also a long duration.


USES

L  Water transmission and distribution:

Linked to the large control insert available in

standard the SUOTE could be used in different    type  of control  circuits  for distribution  (pressure control,flow    control,reservoir    control].

L   Dams and hydropower:

For  small,medium  and   large   installations.In the bottom outlet of a dam with special air-    admission  option.

L   Industrial water applications:

Often  installed  in  different  industries  where  the  pressure control and flow of water are required. The different control mode and the technical

support team permit to advice the most adapted solution for the application.

L   Sewage network and treatment:

Air-flow control valve for activated sludge basins in  sewage  treatment  plants.

By  providing a full control  range,The  Needle

Valve is very often used to control air admission in sludge basins.Energy cost savings are

therefore  much  more  important  than  the  quality treatment.


           

APPROVALS

L NSF,ACS,DVGW for material and coating

OPTIONS/VARIANTS

L   Coating:

250μm EKB fusion bonded epoxy colour blue

L   Materials

Body: Ductile cast iron EN-JS1050

Piston guide: DN100-150 Stainless steel DN200-300 Bronze

DN350-2000 Brass

Cylinder: Stainless steel

Seals:EPDM,KTW and W270-or NBR, others on request

Shaft,Piston: stainless steel

Gearbox body: grey cast iron EN-JL1040

Gearbox crank: ductile cast iron EN-JS1050 Gearbox stem: ferritic  Cr-Ni  steel

Stem nut: special brass

L Cylinder options:

Standard: Seat  ring,Vaned  ring,Slotted cylinder,Perforated  cylinder

Customised:Special cylinder lslotted or

perforated),Throttle ring especially for energy recovery systems,Control attachments for

pump test rig,Control inserts for bottom outlets

L   Different type of actuators from  float

control through hydraulic and pneumatic actuator to electric actuator

NEEDLE   VALVE


CHOICE   OF    MODEL   AND    DIMENSIONING

The SUOTE needle valve contribute to an overall optimized system for a lowest energy consumption when the valve is fully open to an adapted pressure and flow in regulation mode.The energy consumption and flow is also submit to     the cylinder which must be choosen in fonction of the application.The choice of size and cylinder are decisive for an  optimal behaviour of the global system and take place with 2 main elements,the hydraulic performances and the

cavitation risk.Special calculations are necessary for special uses le.g.as bottom outlet,pump bypass,turbine inlet or bypass valve);our engineers would be pleased to perform these calculations for you.

DESIGNED  FOR  BEST  HYDRAULIC  PERFORMANCE:

Key figures are Kv and z[zeta]values

L The Kv-factor of a valve indicates the water flow in m3/h at a

pressure drop across the valve of 1 kg /cm2 at 5-30°C when the valve   is 100%open.

L The head loss coefficientζ (zeta),   also referred to as pressure loss    coefficient or resistance coefficient is a dimensionless measure in

fluid mechanics reflecting the

resistance in a certain hydraulic   element.This resistance depends on the geometry of the system.

L The zeta value can be derived

from the Kv value and vice versa.High Kv factors and low zeta values mean reduced pressure losses and thus,smaller pump capacities.


Note:Special calculations incorporating the precise installation

situation are necessary for the designs marked with an asterisk (*);

we would be pleased to perform these calculations for you based on

your application data.All values have been determined under practical

conditions in SUOTE's in-house test centre.


FLOW SPEEDS:

Following needed application SUOTE valve could be adapted with different accessories like air admission so as to extend the admissible flow velocity to the application need.To ensure perfect operation,for velocities above 1.5m/s we recommend

a straight pipe section of at least 3-5x DN upstream and 5-10 x DN downstream of the valve,within which there must be no fittings or valves.


REGULATION      RANGE:

SUOTE Valve are designed for an optimal  regulation  range  between  10  to  85%of opening.Some  extension of this  regulation range  is  possible  but  need  to  be  controlled  during  the  design  phase  with the technical  support team.

 

CAVITATION    UNDER    CONTROL:

Depending  on  the  pressure  and  velocity  conditions,turbulence  and  cavitation  zones  can  occur  in  pipes  and  fittings  which  can cause vibrations,oscillations and,under certain operating conditions,can even cause material damage.

Cavitation  occurs  if  vapour  bubbles  form  and  implode  in  the  pipe.According  to   Bernoulli's  law,the  total  energy  of  a  flowing medium   is   always   the   same;and   therefore,the   sum   of the   potential ,pressure ,velocity   (kinetic) and   lost   (dissipated)energy  is  constant.If  the  flow  velocity now  increases  at  a  constriction ,e.g.a  needle  valve , the  pressure  energy  simultaneously  falls . lf  the  pressure  falls  below  the  medium's  saturation  vapour  pressure , vapour  bubbles  form  which  further  deform  after  the constriction.Downstream  of  the constriction  the  velocity  reduces  again , and  the  pressure  increases , so  that  the  bubbles  finally  implode . The  microjet  produced  as a  result  can  hit  components with  high velocities  and  remove  component  material where they impact.Therefore,a  decisive  factor for  use  of  the  needle  valve  is  for  the  energy  conversion  to  take  place  in  the  middle  of  the valve,which  is  ensured  by  the  design  of the flow  profile  and  special  control  inserts.


CYLINDER   SPECIALLY    DESIGNED   TO   CENTRALIZE    THE   CAVITATION    IN

THE   MIDDLE   OF   THE   PIPELINE


               

Vaned rin

For average pressure differences and in back pressure


               

Slotted and perforated cylinder

For high pressure differences

Parameters


Structuralprofile


Material of the parts

Manufacturing pressure level

PN0.6-PN4.0MPA

Class150-600



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