A revolutionary way to control

very high pressure drop fluid flow

Introducing . . .

Manufactured by

The unique, least disruptive, axis-

symmetrical annular flow path directs

high velocity, vaporized fluid away

from fluid boundaries throughout the

entire range of control

. . Finally: a high capacity, high recovery control valve

able to withstand continuous choked-flow conditions

throughout its control range.

Applications

Hydrocarbon refining systems requiring

high pressure/high differential precision

pressure control

Injection pump pressure control

Backpressure regulation for pump testing

systems

Boiler feed water injection flow control

Natural gas production flow control when

fluid is contaminated with water and

erosive solids

Any fluid control application where

cavitation damage to control valves has

been observed

How it works

The valve Stem rotates by a multi-turn

electric actuator in response to control

signal.

The pinion gear on the Stem engages

teeth on the Sleeve arranged on a

helical path.

The Power Threads on the sleeve have

the same pitch as the helix of the

Sleeve teeth, causing it to translate as

it rotates.

The Plug is fixed to the intake hub of

the valve body, with the contoured

center portion suspended in the center

by vanes on the upstream side.

Fluid flow is modulated as the distance

between the Seat and Plug changes.

Sleeve

Thrust

Tube Plug

Stem

Power

Threads

Seat

What’s inside ATLAS . . .

API 3-1/8 5000 version shown with Indelac LA-12 actuator

Features

Multi-turn valve stem for precise

control with low torque

requirement

Complies with API 6A or ASME

B16.34 for materials and

construction

Triple-sealed to contain process

fluid up to 450F

Ultralube™ coated flow path and

actuation components

Nitrocarburized 17-4PH

stainless steel trim components

Tungsten carbide or 440C Seat,

TC Plug optional

End configurations to suit wide

variety of applications

Rotary-to-linear internal

actuation employing the helical

bevel gear drive system

(U.S. patents 9,103,421 and

9,404,561. International Pub.

No. WO 2014/186437 A1)

Description

The simple, least restrictive linear

flow path of ATLAS directs fluid flow

to the center of the discharge end

connection. During choked flow

conditions, vaporized fluid recovers

pressure gradually rather than

abruptly because it does not impact

flow path surfaces. Cavitation

damage is avoided.

The trim is a familiar plug and seat

arrangement with a significant

difference: the fluid does not change

direction before or after the plug.

Linear actuation forces are similar to

a typical globe control valve, however

the two-stage internal actuation

system reduces actuator torque

requirement.

. . . A Whole New Way to Control Flow

Half Open

Full Open

Non-linear horizontal scale indicates a 2" Class 1500 flanged control valve in a ISA 75.02 test section.

Globe

HBGV

Upstream Pressure P1

Downstream Pressure P2

Fluid Vapor Pressure

Globe Body

Cavitation damage

Pressure Recovery Zone:

Control valve cavitation and how ATLAS avoids it:

1611 S Utica #338

Tulsa, OK 74104

918-645-7170

info@vsillc.com

Find out more at

www.vsillc.com

170808

ERL - Extended Range Linear EP - Equal Percentage Liquid

Pressure Recovery Factor, FL

Model Nominal Pipe Size

Trim (CV-Char)

Choked Flow CV

Rangeability (5% min)*

Transition to Linear

Gain Rangeability

(5% min)* Initial Lin-

ear CV

EP Transition

Signal Gain

15 2"

6-EP 5 - - 80 0.89 23% 0.15 0.85

10-ERL 8 40 27% 1.06 - - 0.80

10-EP 8 - - 70 1.65 24% 0.16 0.80

30-ERL 23 35 26% 1.05 - - 0.76

30-EP 23 - - 58 5.71 25% 0.19 0.76

70-ERL 49 30 25% 1.03 - - 0.70

21 3"

60-EP 51 - - 58 11.42 25% 0.19 0.85

90-ERL 72 35 26% 1.05 - - 0.80

90-EP 72 - - 40 22.56 27% 0.25 0.80

130-ERL 91 30 25% 1.03 - - 0.70

32 4"

180-EP 144 - - 58 34.25 25% 0.19 0.80

180-ERL 144 40 27% 1.06 - - 0.80

230-ERL 173 35 26% 1.05 - - 0.75

300-ERL 210 30 25% 1.03 - - 0.70

ATLAS Size, Capacity and Characterization

1. Velocity begins to increase rapidly as fluid turns into lower globe body cavity.

2. Velocity increases gradually in ATLAS as fluid enters annular trim restriction.

3. Fluid, still in liquid state, reaches maximum velocity in trim restriction.

4. Fluid instantly accelerates as it passes trim restriction, dropping static pressure below vapor pressure.

5. Velocity decreases as fluid expands past the trim restriction. The upper globe body cavity causes pressure to build rapidly before fluid exits trim, leading to cavitation damage.

6. Absence of velocity restriction in ATLAS maintains static pressure in trim below vapor pressure.

1

2

3

4

5 6

1300 E. Memphis

Broken Arrow, OK 74012 - 800-324-7035

ATLAS

* Control Valve Rangeability as defined by ISA 75.11. Useful range will vary with actuator accuracy and trim degradation.