T R U E D O U B L E B L O C K & B L E E D V A L V E S

U N E Q U A L L E D C A P A B I L I T YS P E C I A L T Y V A L V E S F O R C R I T I C A L S E R V I C E

valvesPETROLVALVES

E X P A N D I N G G A T E S E R I E S

W W W . P E T R O L V A L V E S . C O M

D O U B L E E X P A N D I N G G A T E V A L V E P R O D U C T S

F E A T U R E S A N D B E N E F I T S :• True Double Block and Bleed (one valve to replace two traditional block valves)

• Metal to Metal Primary Sealing System (mechanically energized and not dependent on pressure)

• Metal to Metal Secondary Sealing System (does not rely on any elastomeric or plastic seals)

• Full Hard Facing on all 4 wedge Surfaces (a complete hard face is applied to both sides of each wedge segment)

• Full Hard Faced Seat Rings (wide seal surface profile enhances the flexible seats and solids handling capability)

• Hard Faced Material Options Include Tungsten and Chromium Carbide (HVOF Applied) and Stellite on Base Metal of Closure Member

• Wedge Segments Forged as Standard (no castings for wedge parts)

• Reduced Operating Torque During Cycling (there is minimal if any contact with the seat rings during cycling)

• Full Bore Through Conduit Pipe Line Profile (all pig types pass smoothly without risk to pig or valve)

• Greatly reduces footprint when space is at premium (compact packages improve overall design/functionality)

• Weight savings when utilized as singular Double Block and Bleed Valve (reduces installation cost)

• Special sized compact hydraulic/pneumatic actuators available (PetrolValves unique space saving design)

T Y P I C A L A P P L I C AT I O N :

Double Block and Bleed Service

Suitable for Onshore Applications

Abrasive Media/Suspended Solids

Suitable for Offshore Applications

Pig Launchers and Receivers

Suitable for Sub Sea Applications

Scapers and Traps

Ideal Critical and Primary Isolation Valve

Oil and Gas Transportation Isolation

Emergency Shut Down Valve

Oil and Gas Production Isolation

Separator Isolation/Slurry Discharge

Upstream Gas Compressor Isolation

D O U B L E E X P A N D I N GN O M I N A L S I Z E : 2”-56”

P R E S S U R E C L A S S E S : ANSI 600-2500 API 2000-20,000

D O U B L E E X P A N D I N G G A T E V A L V

CLOSED POSITION RUNNING POSITION OPEN POSITION

P R I N C I P A L O F O P E R A T I O N

> Through conduit pipeline gate valve

offering the highest possible longterm

seat sealing integrity & piggability

> Wedge gate closure member segments

expand to seal from both directions

when the valve is Open or Closed

> Provides a true double block and bleed

isolation capability within one single valve

H O W D O U B L E E X P A N D I N G

G A T E V A L V E S O P E R A T E

THE DOUBLE EXPANDING GATE VALVES OPERATING PRINCIPLE:

The stem drives only the “female “wedge segment at all times via a precision “T” head dive connection, the male segment is permanently attached to the female

segment by the centralizer mechanism which ensures the wedge segments are fully contracted during cycling while permitting the female to develop the

expanding capability. The male and female wedge segments are also mechanically aligned by the centralizing components. The closure member segments expand

in the open and closed positions via the open/closed slopes between each wedge segment, this enables the valves to seal in both directions. While in the open

or closed position, the valve cavity is also isolated.

GATE IN THE FULLY CLOSED POSITION

The “male” wedge segments inertia is first to stop once contact is made with the body’s integral stop. The “Female” wedge segment continues to run along the

wedge close slope and a mechanically dependent expansion of the closure member results, simultaneously sealing upstream and downstream.

GATE IN FULLY OPEN POSITION

A full expansion occurs at the full open position and the backseat is energized. Consequently the body cavity is isolated from both the upstream and downstream

side. The primary seat sealing surfaces are protected by the expansion that occurs in the full open position. This factor makes this valve ideal choice for pig-

ging applications where high integrity isolation on a long term basis is a must.

GATE IN RUNNING STROKE

From the fully closed position or the fully open position, once the closure member is mobilized by the cycling valve, the centralizing mechanism pulls the wedge

segments together to develop a clearance between the primary seal faces in order to minimize the potential for wear on these critical surfaces at all times dur-

ing every cycle. This thereby extends the life expectancy of primary seals.

E P R O D U C T S E X P A N D I N G S E R I E S G A

P R O D U C T D A T A S H E E T

4 COMPLETELYHARD FACED

SEALING SURFACES

CENTRALIZEDMECHANISM

OPEN WEDGESLOPE

MALE WEDGESEGMENT

CLOSE WEDGESLOPE

CENTRALIZERRETAINING POSTS

CENTRALIZERGUIDE

FEMALE WEDGESEGMENT

DESIGN DOUBLE EXPAND

INDUSTRY STANDARD API-6D/ANSI B16.34/API-

BONNET CONSTRUCTION Bolted Bonnet

CLOSURE MEMBER (WEDGE) TYPE Double Expanded

SEAT CONSTRUCTION Unique Patented Flexible

STEM DESIGN IS&Y Non Rising Stem or

END CONNECTION Flanged Ends (RF or RTJ)

BORE Full Bore (per API-6L) (Th

FACE TO FACE DIMENSIONS API-6D/API-6A/Special C

(1) PetrolValves Single and Double Expanding Series Gate Valve (DEGV) offers bubble tight seal simultadouble block and bleed system and can be employed in lieu of two traditional block valves. SEGV is lea

(2) For a non-through conduit feature per API-600, use Single expanding Gate Valve (SEGV) design preferr(3) Pressure vessel materials utilized; Carbon Steel, Low Temperature Carbon Steels, Stainless Steels Dup(4) SEGV Closure Member Segments in Cast A216 as Standard other options available.(5) DEGV Closure Member Segments on Forged A105 as Standard, other options available.(6) Other sizes and Special Ratings are also available upon request.

FEATURES YES NO NOTES

FIRE SAFE • Per API-

NACE MR-01-75 •BI-DIRECTIONAL •METAL TO METAL SEALING (1) • Leak Tes

SOFT SEAT • Not Appl

RENEWABLE SEATS • Standard

CAVITY RELIEF • Optional

VENT CONNECTION • Plug Sta

DRAIN CONNECTION • Plug Sta

STEM EXTENSION • Available

LOCKING • Available

Double Block & Bleed: Two barriers with a bleed between the barriers. A typica

by some valve manufacturers. This is not in accordance with acceptable philosoph

ble block and bleed valve only if sealing forces are independent of line pressure an

valve (typically this would be an expanding gate valve with an integral cavity vent d

states that the valve must be lockable in the closed position to avoid malfunction.

The use of the expanding valve replacing two block valves is generally accepte

standard no permission is required from authorities. The standard can be found a

WWW.NTS.NORSOK.COM Go to - Standards>P-Process>p-

Wedge Gates Closure Member segments expand to seal from both directions whe

P E T R O L V A L V E S C L O S U R E M E M B E R

S E G M E N T S D E T A I L E D I N T H E

P H O T O G R A P H A B O V E

You will note a solid forged female wedge segment lapped and polished to

provide the cavity sealing function. The engineers’ reflection on the close

slope demonstrates our attention to detail. PetrolValves does not employ cast

wedge segments and both wedge slopes open and closed are completely

carbide hard faced using HVOF technology. Petrolvalves wedge segments

have no integral stop built on which can influence negatively the valves

sealing integrity. All stops are integral to the body and bonnet.

A N D I N G G A T E V A L V E P R O D U C T S

V A L V E P O S I T I O N

CLOSED OPEN

FULL BORE FLOWCHARACTERISTICS

WHEN VALVE ISOPEN

TRUE DOUBLEBLOCK SEALWHEN VALVE

IS CLOSED

• Wedge gate closure member segments expand to seal from both directions when the

valve is cycled to closed.

• Provides a true double block and bleed isolation capability within one singular valve.

H O W S I N G L E E X P A N D I N G

G A T E V A L V E S O P E R A T E

The Stem drives only the female wedge segment at all times via a typical T Head drive mechanism,

the male segment is permanently attached to the female segment by two casehardened

shoulder bolts acting as guide pins which allow the male segment to float up or down against the

female to develop the expanding capability. The male and female wedge segments are also

mechanically retained at the lower toe end of the closure member assembly and this acts as a limit

stop controlling the centralizing mechanism when the closure member expands, the same

mechanical preload is discharged as soon as the valve starts its cycle from closed to open, thereby

dramatically reducing friction between the primary sealing surfaces during each and every cycle.

H O W S I N G L E E X P A N D I N G

G A T E V A L V E S O P E R A T E

GATE IN FULLY CLOSED POSITION

• The stem pushes downward on the Female wedge segment, the Male simultaneously follows.

• The Male wedge segments’ inertia is first to stop once contact is made with the body’s integral stop

provided in trim material and located on the bottom of the body.

• The Female wedge segment continues to travel along the wedge slope and an expansion of the

closure member segments occurs and results in a simultaneous upstream and downstream seal

seating.

GATE IN FULLY OPEN POSITION

• No expansion occurs at the full open position. The stem backseat seal can be energized if needed.

GATE IN RUNNING STROKE

• From the closed position, as soon as the stem “T” head begins to lift the female wedge segment, the

mechanical preload stored in the centralizing mechanism discharges to centralize the wedge

segments and thereby contracts them to develop a clearance between the primary seal faces in order

to minimize the potential for wear on these critical surfaces as the valve cycles.

POS. PART NAME

1 BODY

2 SEAT RING

3A GATE

3B GATE

4 STEM

5 BONNET

6 BONNET GASKET

7 BONNET STUD

10 BONNET STUD NUR

15 GLAND

16 GLAND PLATE

17 PACKING

19 SUPPORT

52 DRAIN FLANGE

58 VENT DEVICE

62 GLAND BOLT

63 GLAND BOLT NUT

138 LEVER

141 SLIDING

143 GUIDE

144 GUIDE

474 PIN

Body stop

T E V A L V E S P R O D U C T S S I N G L E E X P A

NG GATE VALVE SINGLE EXPANDING GATE VALVE

A/API-17D API-600/ANSI B16.34

Bolted Bonnet

Single Expanded

eats Renewable Seats

S&Y (Rising Stem) OS&Y Rising Stem

Butt Weld or HUB Flanged Ends (RF or RTJ), Butt Weld or HUB

ough Conduit) (2) Full Bore per API-600 (2)

tom Length Per ANSI B16.10 (ANSI B16.5 and B16.25)

ously and independently in both the upstream and downstream seat. The valve this creates is a true ested per API 598 and the DEGV ios leak tested per API-6D (other leak tests are available upon request).alternative. or Super Duplex materials of construction.

FEMALE WEDGESEGMENT

GUIDE PIN

AUTO INTERNALCENTRALIZING

MECHANISM(NOT DETAILED)

MALE WEDGE SEGMENT

A&B PORTPRIMARY SEALING

SURFACES AREHARD FACED

WEDGE SLOPESWITH HARD

FACING

BODY GUIDE

M/F MECHANICALRETENTION AT TOE

C L O S U R E M E M B E R A S S E M B L Y

YES NO NOTES

A • Per API-6FA

••

ng Per API-6D (1) • Leak Testing Per API-598

able • Available in Requested

• Standard

onfigurations • Optional Configurations

ard/Valve Optional • • Available on Request

ard/Valve Optional • • Available on Request

on Request • • Available on Request

on Request • • Available on Request

arrangement is two defined in API and ISO DIS-14313, which has been adopted

as defined in the Norsok standard. Where a single valve is acceptable as a dou-

where a bleed connection is provided between the two sealing faces within one

vice installed onto the valve body or bonnet vent/drain port). Furthermore Norsok

standard in Norway and described in the Norsok standard. As it is a Norsok

he following web site address:

01,Process Design, Rv.4, Oct 1999>Definitions>Double Block and Bleed

the valve is cycled to closed.

STELLITE,TUNGSTEN OR

CHROMIUM CARBIDE HARDFACE OPTIONS

Optional soft sealingmaterials available;

• Teflon• Nylon• Peek• Delrin

S I N G L E E X P A N D I N G G A T E V A L V E P R O D U C T S

N O M I N A L S I Z E : 2”-36” (custom sizes available on request)

P R E S S U R E C L A S S E S : ANSI150-600 (Custom Pressure Classes Available on Request)

F E A T U R E S A N D B E N E F I T S• True Double Block and Bleed (one valve to replace two traditional block valves)

• Metal to Metal Primary Sealing System (mechanically energized and not dependent on pressure)

• Metal to Metal Secondary Sealing System (does not rely on any elastomeric or plastic seals)

• Full Hard Facing on both wedge sealing surfaces (precision integral hard faced pads between each wedge segment)

• Full Hard Faced Seat Sealing Surface (renewable seats for easy maintenance)

• Hard Face Material Options include Stellite, Tungsten and Chromium Carbide (HVOF Applied)

• Soft Sealing Options Available (Teflon, Nylon, Nylon PA12, Peek, Devlon and others also available)

• Reduced Operating Torque during cycling (there is minimal if any contact with the seat rings during stroking)

• Full Bore Flow Characteristics (low friction loss through valve)

• Greatly reduces footprint when space is at a premium (compact packages improve overall design functionality)

• Weight savings when utilized singular double block and bleed valve (greatly reduces installation cost)

T Y P I C A L A P P L I C A T I O N SDouble Block and Bleed Service Suitable or Onshore Application

Abrasive Media/Suspended Solids Suitable for Offshore Applications

Oil and Gas Transportation Isolation Ideal Critical and Primary Isolation Valve

Oil and Gas Production Isolation Pump and Exchanges Isolation Solution

Separators Waste Discharge Isolation Metering Skids

S I N G L E E X P A N D I N G