FDS Cryogenic Rotary Valve

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Invented, tested and made in USA

Without Stem extension under - 450 F ?

Design Features

Cryogenic Crossover Rotary Valve

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The cryogenic crossover rotary valve are based on two breakthrough technologies (1) combining

the best features of triple offset , double offset butterfly valves and metal seat ball valve as one with

optimized thermal , mechanical and fluid dynamic characteristics (2) combing metal and nonmetal

thermal properties to define thermal barrier at seal surface , as results the composite seat and

packing less shoulder seal were developed to achieve the highest performance no other ever can , it

can sustain the temperature gradient between ambient and –450 F temperature while keeping suffi-

cient contact stress for positive seat seal under Class VI and positive shaft seal without stem extension

no other ever can

Pressure Class 150-900

Valve Size 3”-24”

Temperature -450 F to 1800 F

Leakage Class : VI between ambient and –450 F Fluid content : Gas, Liquid and fluids

Operation speed <1– 10 Second

Operation type: On-off and throttling Body Type Wafer, Lugged, Butt weld and double flanges

No Extension

Need

Thermal bearing

bushing

Shoulder shaft

Installed at any

position

Thermally smart disc Universal body

Thermally Smart seat

Fire Safe

Dual Wedge joint

Buckling stop pin

Non –destructive

feature shaft

Packing less

metal to metal

shoulder seal

Fire safe

-450 F

+ 68 F

+ 68 F

The unique belleville seal

has changed the history of

metal seal and is deigned

to have ID conical surface

and OD conical surface seals

in stead of convectional ID

or OD seal with front or

back seal as well ,since ID

surface angle is offset from

OD surface angle , so the

more compressed, more

sealed due to opposite

angles and acts a Belle-

ville spring to keep constant

compress force and seal

forces and compensate any

wearing , since seal ring is

not pressed when the disc

is at open positions, the

seal ring has much long life.

The composite seat is

designed to hold the seat

seal at big temperatures

difference , no other metal

to metal can hold seals as

well as can sustain rapid

closed speed less than 1

second or the seat would

be freeze and no other met-

al to nonmetal seals can

sustain and provide seal for

ANIS Class 6 , the nonmet-

al ring is designed to create

a thermal barrier around

the metal to metal seal , so

metal to metal seal can

operate and hold seals

without damage of the seat

only the temperature gra-

dient is less some % , while

all rings must be free to

move and remain the simi-

lar profiles under many

thermal change cycles.

Proprietary technologies

and multiple patents and

pending around the world

Design Features

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Thermally Smart seat—ultimate sealing machine

1-2

Outside offset seal conical sur-

face from inside seal conical

surface are under compression

like belleville spring

Prior to seating After seating

Inside seal conical surface and out-

side conical surface are under no

compression condition , such condi-

tion would increase seat life

lock plug with an

eccentric slot

Body ,disc and seat with seals Body ,Disc and seat with seals

Offset angle

Composite ring

Nonmetal + metal + nonmetal

Nonmetal thermal barrier to protect metal to metal seal

Metal seat /metal disc

Nonmetal

-350 F 68 F

Smart seal retainer

Thermally Smart Seal ring

Lock ring Seal retainer

Wedge lock ring

setscrew

Disc

Eccentric lock plug lock screw

Thermally Smart Seal ring

Disc Body

Seat

The packing less stem seal as-

sembly is designed to seal and

bear the rotary stem at high

temperatures 850 F and up to

1800 F or lowest to -450 F ,

when air is heated to 850 and

up, the graphite suffer greatly

oxidation and become ash , so

packing less seal assembly are

fully metaled , the rotary shaft

has a conical or spherical shoul-

der with a pair of wedge rings

installed on top and bottom of

the shoulder, a top and a

bottom plate to support the top

and bottoms of wedge rings.

While l gases are liquefied un-

der –250 F , no nonmetal can

sustain freeze condition, while

metal can sustain the freeze

condition but cannot hold seal.

The stem seal assembly convert

the dynamic seals between the

stem shoulder and wedge rings

to static seals , the static seal

between the wedge rings and

top and bottom plates to dy-

namic seals, special high temper-

atures

liquid is filled into the cavity of

the stem assembly for providing

liquid seals and lubricating

Design Features WWW.FDS-VALVE.COM 1-3

Full metal stem seal

Bottom plate

Port A

Stem

Liquid seal

Metal wedge ring

Smart Packing less seal- Ultimate Stem Seal

Surfaces against

bottom plate sur-

face. Static seal

wedge ring

Dynamic seal

Surfaces against Top

plate bottom sur-

face ,static seal

Top plate

Rotary

Stem

Stem Shoulder

Wedge seal rings

Top plate

The unique shaft shoulder seal

is designed to hold axial force to

keep seal force instead of hold

axial force to convert radial seal

force like conventional stem

seal and acts like bearing to

control rotary movement as

well as axial movement with a

pair of wedge ring set so it

can sustain big temperatures

change or rapid rotation , so

there is no cool box or stem

extension need, it is installed at

any position vertical or horizon-

tal or between and designed to

hold the seat seal ring at big

temperatures difference no

other metal to metal can hold ,

while it can sustain rapid closed

speed less than 1 second no

other metal to nonmetal seals

can sustain and provide seal for

ANIS Class 6 and severe appli-

cations , the nonmetal ring is

designed to create a thermal

barrier around the metal to met-

al seal , so metal to metal seal

can hold only when the temper-

ature gradient is less some % ,

while all rings must be free to

move under thermal change,

above all , nonmetal is no Elec-

trical conduit, metal is electrical

conduit, they each play different

role in the boundary between

liquid and sold .

A pair of eccentric plugs are

designed to replace the conven-

tional gland and bolts , which

generates uncontrolled com-

pression on the packings , the

distanced between the highest

point in the plug are based

on the optimized compression ,

, once the compression reach

the lowest point, the packing is

need to be replaced.

Design Features

Shoulder Seal — a key for cryogenic shaft seal

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Shaft

Eccentric lock plug to press up the

packing by rotating from 0–180 degree

180 Degree limit

Spring pin

The lowest point

with a Mark

Push down by

rotating

Wedge ring

metal sup-

port ring

Fire safe

Shaft bearing Bearing engaged slot

180 Degree limit

Wedge ring set

Nonmetal

Metal

Nonmetal

Metal to metal seal

Metal wedge

ring set

support ring - 350 F

Ambient temperature 68 F

Eccentric plug

engaged head

Nonmetal out ring

The dual wedge Joint is designed

for high speed or impact opera-

tion by eliminating stress con-

centration and destructive on the

rotary stem and by separating

bending from driving force ,

equally distributing driving force

with the dual wedge joint , it

greatly reduces bending stress

and hub size to improve fluid

rate, while the center of disc has

the strongest cross section to

transfer driving force to shaft

with larger wedge area of double

sides , so it not only to secure the

joint without weakening the shaft,

but also improve the overall flow

rate with less cross section in the

center as well as the hub areas.

Streamlined disc reduces pres-

sure drop by 15 % or more and

turbulence with reduction of hub

size and cross section of center of

the dice without reducing

strength of the shaft or disc .

Free thermal expansion , re-

stricting shaft from axial expan-

sion causes 15 % of seat leakage

under the thermal change be-

tween 60F to 1200 F or 60 to –

450 F if the shaft is secured by

pins, which eliminate axial free-

dom, with the dual friction

wedge joint , the shaft would

freely expand axially without

damaging the seat or shaft

seals.

Wedge free from failing out ,

since the wedge has the same

materials as the disc , they would

be not loss engagement with the

disc even under high vibration ,

the wedge shape unlike the pins

joint , under the shear stress , the

pins in most case has a stronger

material than the disc , under

thermal expansion , they would

fall out would prevent it from

Design Features

Dual wedge joint— for dynamic operation

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The hubs areas have the highest

stress for disc and shaft and count

for 90 % driving failures during

approaching full closing or opening

and under water hamper

Shaft has no stress concentra-

tion or destructive features like

pin holes and keyway

Setscrew to elimi-

nate clearance

between wedges

and shaft

Dual Wedge joint elimi-

nates all destructive fea-

tures and stress , with

dual wedge joint, the tor-

sion become compress

only , wedge and disc

have the same materiel,

Bending

Bending

Driving

Bending

Bending

Driving

Wedge engage-

ment with self

lock angle

Free

thermal

expan-

sion

The bushing and stop pin are a

part of dynamics devices to

deal with dynamic operation

due to the temperature or

movement changes

The bushing combines a seal-

ing and bearing as one, the

bearing teeth act as a bearing

to support shaft at high temper-

ature , the grooves is filled with

grease to provide seals as well

as to lubricate both shaft and

bushings while the spring pins

to support the shaft under

both lower and high tempera-

tures , or thermal expansion or

impact force due to shaft side

load from disc ,

Liquid is filled between the

bushings for providing liquid

seal .and lubrication

Buckling stop pin is designed

to absorb the impact when the

disc is to closed or cut solid

particles build up like coking ,

since buckling condition hap-

pen away below yield

strength , the pin would not be

damaged while it stores 35 %

impact energy and greatly in-

crease the seat as well the

bushing life.

The great benefit for both

Control valves and on-off

valves , the control valves are

constantly on moving, the bear-

ing plays a key part of smooth

operation, while the stop pin

plays a key part for emergency

shut off without damaging the

valve

Design Features WWW.FDS-VALVE.COM 1-6

Low temperature seal

body bushing

Contact surface

Buckling stop pin

For fast operation and high impact

Spring pins for bearing under

large thermal change and im-

pact forces

Bushing /Stop Pin for dynamic operation

liquid seal under high or low

temperatures

Buckling groove

Bearing teeth and seal

groove with liquid

Smart handle is designed to

have smart /friendly inter-

face with hands and eye and

include a position base

plate and basic detachable

handle and sign detachable

handle

The position base plate has

a position plate with a pair

of 10 position step slots ,

each step slot has a small

slot for the lock position,

the large slot for cap screw

position , top bar is secured

by two screw from the

bottom and coupled with a

shaft by two spring pins,

each position are secured by

two cap screws or one cap

screw and a lock for high

vibration or secure opera-

tion area.

Handle grips are made out of

color aluminum to indicate

working zones , like high

pressure zone, process

zone,

Sign handle is used where

operation spaces are limited

like offshore platform , ma-

rine , or remote area like

pipelines, the horizontal

position is operation posi-

tion, vertical position is to

display sign and stored posi-

tion.

The actuator include two

types (1) scotch yoke de-

signed to handle fast on-off

operation (2) the vane

actuator I designed to han-

dle fast cycle or throttling

operations , they are well

designed to fit each valve

as one unit

Design Features

Operation - Smart /Secure Interface

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Port A

Secured Position Plate

Triple, balanced

scotch yoke actuator

Basic detachable handle

Triple ,balanced

vane actuator

Sign detachable handle

21 first century digital twin

development methods

The module design simplify

process with a base lugged

body and can be used alone

or combined with a pair

flanges for double flanges

or a pair butt weld flanges

for butt welded joint, so the

universal 3 pcs body assem-

bly can replace any face to

face configuration .

Attachable seal ring is

placed between flanges ,

even under high or low tem-

perature change or pressure

surge, the flanges are still

well sealed , the seal ring is

not reusable , the big ad-

vantage is to replace weld-

ing process .

The left and right trim set is

used to control the flow

conditions I like cavitation,

erosion in a more efficient

and optimized way , since

the incoming flow stream

is divided two , each stream

is conditioned by one trim,

at full opening , the flow

capacity only is reduced by

30 % , the trim is easily to

be replaced and installed .

Design Features

Performance - By Design/verification/ Validation

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CFD Simulation for verification

of the design

Attachable flange

metal seal

Butt-welded side body or

double flange side

Composite Seat

The real product tests for

validating the design

FEA Thermal analysis

Left and right trims 3 PCS Body for double

flanges or butt welded con-

nection

the data acquisition system

WWW.FDS-VALVE.COM 2-1 Selection

Cryogenic Crossover rotary Valve application

LNG Terminal On/OFF valve

LNG Tank On/OFF valve

Liquid O2 and H 2 vessels

/ fuel delivery system

Liquid Gas Process plant

Control/On-Off Valve

Cryogenic Lab

Selection 2-2

Application Menu (1)

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Selection 2-3

Sizing - Cv (2)

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WWW.FDS-VALVE.COM Selection 2-4

Installing—Overall dimension (3 )

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Connecting - Top work dimension (4)

Selection 2-6

Operation—actuation (5)

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Order Info

Order Table

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