CONTROL VALVES

VALVITALIA

GLOBEContoured plugLTG1LTG2

CONTROL VALVE SERIES

GLOBECage-GuidedLTG3LTG4LTG5LTG6

3-WAYMixing & DivertingTRV1TRV2

BUTTERFLYDouble eccentricDYNA-LOKDYNA-LOK TBK-LO

BALLFull bore and V-PortCB-54CB-55CB-56

STEAM CONDITIONINGand DesuperheatersystemsPRDVSAN

ANGLE BODYAngle style bodiesLTA1, LTA2, LTA3… SeriesLTU (urea service)

General Purpose LTG1 Control Valves Series

• Contoured plug

• Top guided plug

• Characterized throttling plug: • Equal %• Mod. Linear• Linear• Quick-Opening

• Wide range of applicability

• DN up to 6”

Quick-Change Trim LTG2 control valves series

• Contoured plug

• Top guided plug

• Quick-Change Seat feature

• Characterized throttling plug

• Higher temperature service

• Soft-Seat design and Leakage class VI available

• DN up to 6”

LTG3 Cage-guided Control Valves Series

• Cage-guided plug

• Throttling cage

• Quick-change design

• Balanced plug construction

• No practical limitations to p/T

• Noise and Cavitation control

Plug SEAL RINGS and Leakage Classes

PRESSURE & TEMPERATURE WITHSTANDING CAPABILITY

Multipath–Multistage trim The fluid is splitted into several smaller jets and the whole pressure drop is divided in many stages. The flow energy is dissipated by shock-eddy interaction .

• Quick-change design

• Improved Anti-Cavitation and Low-Noise design• Balanced plug

• Leakage class up to V

• Cv and noise calculation according to IEC std

LTG3 MPS trim design

LTG3 Cage-guided Multi-Stage MPS

LTG3 Cage-guided Multi-Stage MPL trim

•Multipath–Multistage

• Labyrinth disk stackThe fluid passes through a great number of turns and restrictions and its energy is dissipated along the tortuous flow path.• Quick-change design

• Anti-cavitation and low-noise design

• Balanced plug

• Leakage class up to VI

Labyrinth multipath trim for the best noise reduction and the full anticavitation protection

04/17/23 9

Velocity control principle• Single stage pressure drop

P = P1 - P2

• Multi stage pressure drop

VALVITALIA - TGT Division 10

VALVE VELOCITY PROFILE (liquid)(single stage)

PressurePressure

P1

P2

V2V1

VelocityVelocity

FlashpointFlashpoint

Inlet Outlet

VALVE

PV

PVC

CavitationCavitation

VVC

InletPressure

InletVelocity

vc = Vena Contracta

Outlet Velocity

Outlet Pressure

11

Inadequate velocity control (liquid)

Inlet Outlet

VALVE

VALVITALIA - TGT Division 12

Multi Path Labyrinth (MPL) VELOCITY CONTROL PROFILE

P

1

V1V2

P2

PressurePressure

VelocityVelocity

FlashpointFlashpoint

Pv

InletPressure

InletVelocity

Outlet Velocity

Outlet Pressure

DYNA-LOK Rotary Control Valve

•Plain Disc with Double-eccentric design

• Body type: flanged, wafer, lug up to DN 2000

• Ratings: up to ANSI 300, PN 40 ANSI 600 up to DN 600

• Travel : up to 90°

• Leakage classes: up to class V with teflon seal ring up to VI with metal seal ring

• Low torque design DYNA LOK SPECIAL HIGH PRESSURE CONSTRUCTION - LUG BODY DESIGN

K-LO High Performance Rotary Control Valve

• Body type: flanged up to DN 2000

• Rating: up to ANSI 300, PN 40 up to DN 600 included - ANSI 150 PN 16 for greater sizes.

• travel : up to 110°

• Leakage class: up to class V with teflon seal ring and up to VI with metal seal ring

• Low noise and anti-cavitation disc design

0

1

2

3

4

5

6

7

8

9

0 5 10 15 20 25p1 [bar]

p

MA

X [

bar]

DYNA-LOK K-LO

K-LO Disc Details

Low noise K-LO drilled discs

K-LO Anti-cavitation discs

Ball Control Valves CB Series

Control Ball Valves CB series provide an excellent tightness, typical of on-off ball valves with a high Rangeability (up to 200:1).

CB series valves match together the ability to transfer large volumetric flows with the possibility of a precise control action at small flows .

Special trims design with noise and cavitation abatement.

CB54 with a particular downstream drilled disc especially designed to reduce noise

CB55 with special drilled plates:

• MS trim, standard solution: good flow control, low noise and no cavitation trim

• MSC trim, for a more precise control at small flows

CB56 with special V-Port trim.

Ball Control Valves Series CB54 – CB55 – CB56

CB54

CB55

CB56

SPECIAL CONTROL VALVES

LTU Control Valve Series

• Especially designed to ensure long life and very reduced maintenance costs for severe and demanding service of urea processes.

• Flashing can also be handled by these valves: the careful selection of flow area passages limits fluid velocity and noise.

• different models available depending on the particular service conditions.

Applications

Features

• Forged body obtained from special stainless steels block.

• Integral bonnet to avoid leakage and internal dead cavities.

• Special packing seal rings with no dead zones into the packing box.

• Optional double packing with intermediate connections for heating or flushing.

• No gasketing for the connection of seat ring to body. A metallic lens-shaped joint is used to ensure a self-alignment assembly against the bending effects of piping.

• Optional internal jacketing of body is available to allow an integrated free-leakage heating system.

• For on-off service but used as well for not demanding control services Typical application = check stop dampened

• Service downstream pumping stations

DYNA-LOK-TB Series

Applications

Features

• Sizes from 600 to 3000 Rating up to ANSI 300

• Pneumatic, hydraulic and electric actuators Counterweight for check stop service

• Tight shut-off available – the patented seal ring “spyret” fitted on the disc allows an easy maintenance

Features:

- straight-way and angle body - ratings up to ANSI 1500 - sizes 3” through 12” - max Δp = 30 bar at max Cv 180 bar at min Cv - max temperature = 250°C

RV631 Control Valve Series

Variable resistance trim

number of stages = 6+3+1

xFZ > 0.8 up to 60% of travel

xFZ

PRDVDESUPERHEATING CONTROL VALVES

PRDV Control Valves Applications

Gas turbine

Cooling water

Turbine exhaust

Dumper

Condenser

H.P. / L.P. PRDV Control Valve

H.P.

H.P.

L.P.

L.P.

L.P.

Water

M.P. / L.P. PRDV Control Valve

Desuperheater

Process Steam

M.P.

H.P. / M.P. PRDV Control Valve

M.P.

Fuel

Air

Water

Water

Water

Steam Generator

COMBINED CYCLE

PROCESS

PATENTED DESIGN

PRDV Main Features

Injection point details