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Franklin — DURASEAL™ High Integrity, Double Block and Bleed Plug Valve

How the DuraSeal™ Works


TABLE OF CONTENTS

3. Duraseal - Internal View
4. Operation/Applications
5. Standard Materials of Construction D700 Reduced & D600
Full Bore
6. Preferred Mounting Positions For DuraSeal
7. Gear Operated DuraSeal D700 Series Reduced Bore ANSI 150
8. Gear Operated DuraSeal D700 Series Reduced Bore ANSI 300 & 600
9. D700 Handwheel Operated DuraSeal
10. Gear Operated DuraSeal D600 Series FULL BORE ANSI 150
11. Gear Operated DuraSeal D600 Series FULL BORE ANSI 300 & 600
12. Electric Motor Actuation and Extensions
13. Flow Coefficients (CV) and Torque & Turns- DuraSeal
ANSI 150, D700 & D600 Series
14. Flow Coefficients (CV) and Torque & Turns- DuraSeal
ANSI 300/600 D700 & D600 Series
15. Actuator Adaption-Gear Operator Mounting
16. DTR-Operation
17. DTR-Manual Bleed
18. DTR-Standard Configuration
19. DTR-Line Relieving

An improved valve with a proven history
We took an alternative path. Unlike many valve
manufacturers who often strip valves in their
quest to reduce manufacturing costs, we have
taken a proven double block and bleed plug valve
and improved its design.
With the new DuraSeal™, you get the proven
advantages of a valve that has been considered
the standard of quality since 1951. To improve the
valve’s integrity, we have incorporated a superior
slip design and more durable body. To improve
performance and longevity, we have incorporated
a more reliable stem seal design.
In short, the new Franklin DuraSeal™ is made to
last - not to make a quick sale.

Reliable double protection mechanical seal
The Franklin DuraSeal™ plug valve seals
mechanically. During rotation of the plug there
is no abrasion or wear between the sealing
surfaces. When the slips reach the closed position
they expand firmly into the valve body creating
a primary elastomeric and secondary metal-tometal
backup seal. The DuraSeal™ does not
require sealant under any circumstance to seal.
Fast Low Torque Operation
The DuraSeal™ can be easily automated using
hydraulic or pneumatic or electric actuators.
Torque requirements are low. In smaller sizes
only two and one quarter turns can fully open or
close the valve.

Field Repairable/Interchangeable Parts
DuraSeal™ parts are completely interchangeable with
the original 800 Series General Valve Twin Seal™ double
block and bleed plug valve. DuraSeal™ components
manufactured from superior materials can upgrade
existing TwinSeals™ in the field. The DuraSeal™ can be
repaired inline after depressurizing and draining the valve
without special tools. Simply remove the valve’s lower
plate or bonnet and replace the slip/seal assemblies from
top or bottom of the valve.

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The Franklin DuraSeal™ High Integrity Double Block and Bleed Valve

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Operation / Applications


VALVE OPERATION
Opening the Valve: Turn the hand-wheel counter clockwise. During this operation the plug is raised while the slips are retracted away from the body. When the slips are fully retracted from the body seating area, the plug is then able to rotate 90 degrees to the fully open position. When the valve is in the full open position,the slips and slip seals are completely protected from line flow.
Closing the Valve: Turn the hand-wheel clockwise. During this operation the retracted plug and slips are rotated 90 degrees without body contact. This rotation continues until the slips are positioned over the upstreamand downstream port areas. Continued rotation of hand-wheel mechanically forces the plug downward and forces the slips outward to seal firmly against the valve body. This produces a secondary metal to metal seal on both upstream and downstream areas providing double isolation.

APPLICATION NOTES
• Biofuels Product Isolation: Secure sealing of Biofuels is critical in protecting the environment. The
Duraseal® DBB with its verifiable secure shutoff is perfect when process must be contained.
• Multi-Product Manifolds: Some pipeline manifolds need to flow various products (e.g. diesel, jet fuel,
gasoline, etc.) reliably and without contaminating one another. This DURASEAL® DBB Valve is used to
provide positive shut off and zero leakage to prevent cross contamination.
• Prover Loops: In prover loops, the calibration of flow meters requires that every valve in the system
must have zero leak rates. Any leak could mean an error in calibration. The DURASEAL® DBB Valve is
used to ensure that when the valves in the system are closed, they are leak tight.
• Custody Transfer Units: Transfer of valuable media relies on accurate measurement of product. The
DURASEAL® DBB provides secure tight shutoff ensuring that the transfer is accurate.
• Terminals: Loading and unloading tanker vessels requires positive sealing in order to prevent spillage
into the water. The DURASEAL® DBB provides such positive sealing and is the most reliable in the
market.
• Tank Farms (Oil Depots): Valves used for tank isolation needs to work reliably with zero leak rate.
These valves are also operated frequently. The DURASEAL® DBB valves provide a reliable long term
high integrity seal designed for frequent use with verifiable zero leak.
• Aviation Fueling Systems: Fuel hydrants at airports need to allow for quick maintenance, repair, leak
locating and testing. This requires a valve that can close quickly and positively seal off the relevant
sections. The DURASEAL® DBB Valve’s variable zero leak rate ensures that maintenance, repair, leak
locating and hydrant testing can be done quickly and safely. Import/Export Facilities.
• Offshore Platforms: Secure shutoff is imperative on an offshore platform in that leakage can result in
contamination of the water and possible equipment damage. The DURASEAL® DBB is the best choice
for low pressure positive shutoff.
• Blending Units: The accurate blending of high grade fuels requires valves of high sealing integrity to
insure accurate addition of additives in blending operations.

Standard Materials of Construction D700 Reduced and D600 FULL BORE

700 & 600 SERIES

D711 & D611 ANSI 150

D721 & D621 ANSI 300

D741 & D641 ANSI 600

 

Body

CAST CARBON STEEL

ASTM A216 WCB WITH CHROME PLATED BORE

CAST CARBON STEEL

ASTM A216 WCB WITH CHROME PLATED BORE

CAST CARBON STEEL ASTM   A216 WCB WITH CHROME PLATED BORE

 

Bonnet/Lower  Plate

CARBON STEEL ASTM A216 WCB or ASTM A350 LF2

CARBON STEEL ASTM A216 WCB or ASTM   A350 LF2

CARBON STEEL ASTM A216 WCB or ASTM A350 LF2

 

Plug

ASTM A216 WCB or ASTM   A487 – 4D WITH   ELECTROLESS

NICKEL PLATING (1)

ASTM A216 WCB WITH ELECTROLESS NICKEL PLATING (1)

ASTM   A216 WCB & ASTM A487 – 4D   WITH ELECTROLESS NICKEL PLATING (1)

 

Stem

A216 WCB or ASTM A487 4D WITH ELECTROLESS NICKEL PLATING (1)

A216 WCB WITH ELECTROLESS   NICKEL PLATING (CAST PLUG) (1)

A216 WCB or ASTM A487 4D WITH  ELECTROLESS

NICKEL PLATING (1)

 

Slips

Ductile Iron ASTM A536

Gr 80-55-06, ASTM A 395 60-40-18 or ASTM

A516 gr 70

Ductile Iron ASTM A536

Gr 80-55-06, ASTM A 395 60-40-18 or ASTM A516 gr70

Ductile Iron ASTM A536

Gr 80-55-06, ASTM A395 60- 40-18 or ASTM A516 gr70

Gland

17-4 SS

17-4 SS

17-4 SS

Gland Packing

Graphite

Graphite

Graphite

Body Fire Seals

Graphite

Graphite

Graphite

O-Rings & Slip    Seals

See trim selection

See trim selection

See trim selection

Fasteners

ASTM A193 Gr. B7 / 2H

ASTM A193 Gr. B7 / 2H

ASTM A193 Gr. B7 / 2H

Note:  All Materials subject to change without notice. *Manganese Phosphate Coating available * NACE SPECIFICATION AVAILABLE *ENP Bore available

(1) In accordance with NACE MRO175 Latest Edition

Proper seal selection requires a number of considerations such as media, pressure class, differential pressure, low temperature, high temperature, seal type, etc. To that end we have included a selection of slip seal materials and a

brief list of considerations:


Fluoro Elastomers Slip Seal Materials                         

V

Viton

Our Standard Material

V9

Viton 90 Durometer

Standard HIDP

VFR

Fiber Reinforced Viton

Optional HIDP

VGF

Viton GF

Viton with Enhanced Chem. Resistance

VGLT

Viton GFLT

Low Temp Viton GF

VGLT9

Viton 90 Durometer GFLT

HIDP Low Temp Viton GF

Nitrile Elastomers Slip Seal Materials

H

Nitrile

Standard Nitrile

H9

Nitrile 90 Durometer

HIDP Nitrile

LH

Low Temp Nitrile

Low Temp Nitrile

H5

Modified Nitrile

Reformulate Gasoline Seal Material

Specialty  Slip Seal Materials

C

Epichlorohydrin

Good Low Temp Material

E

Ethylenepropylene

Ammonia but not Hydrocarbon

UHS

Fluorosilicone

Good High and Low Temp

AFL

AFLAS

Amines, exp. decomp., steam, 450° F

All specifications and materials are subject to change without notice. DURASEAL conforms to API 6FA testing

Preferred Mounting Positions for DuraSeal Valve

1.0 SCOPE OF INSTRUCTION

        This information is provided for support of the Duraseal Valve in maintaining the maximum life and function of the valve.

        The contained information is subject to change without notice.

        This document provides information for typical installations. In the event of unique situations, please contact your representative or the factory.

2.0 DEFINITIONS

        DBB - Double Block and Bleed, method to test seat integrity with valve closed while under pressure.

        DIB-1 - Double Isolation and Bleed, Bi-Directional seating. API 6D definition of redundant sealing surfaces in both flow directions.

        DTR - Differential Thermal Relief, provides the cavity relief functions of API 6D. Also contains DBB bleed function.

3.0 CONSIDERATIONS

        Positioning of valve to provide operational access in installation. This is of particular concern for manually operated valves in pipe racks. Operator and handwheel extensions are available to improve access. See PUB-002-EN for details on the extension of DTR systems.

        Positioning of DTR to provide proper function. The DTR relief direction should be toward the pressure side to be isolated. In a typical piping system, there is often a specific direction. When isolating equipment such as pumps, the preferred isolation may be different from the prevailing flow direction. See PUB-002-EN for DTR details.

        Positioning of bleeds and drains to provide adequate operation. On valves which require complete draining, ensure that drains are positioned to provide complete draining. On valves which require DBB operation, it is typically preferable to position bleed valves for an elevated position so that DBB bleeds the minimum amount of liquid.

        Positioning for reducing damage due to solids contained in fluids. With solids in the fluids

it is preferable to have regular draining of the body cavity to reduce accumulation and reduction of performance. It is also preferable to have the DTR to the upper side so that solids do not damage the DTR checks or valves.

4.0 PREFERRED MOUNTING POSITIONS

        Positioning of the stem in the vertical position or with the stem above horizontal is acceptable. User must take drain and bleed issues into consideration.

        If the valve is oriented with the stem in the horizontal position, it is preferable that the left flange is receiving the prevailing flow and that the DTR is on the upper side. This provides an inlet flow upon opening that tends to flush out any accumulated solids.

        Mounting of the valve with the waterway oriented vertically is acceptable. This provides an inherent cavity flushing characteristic in both the upward and downward flow directions.

        Mounting the valve with the stem facing down is non-preferred, but may be acceptable for very clean conditions. This exposes the stem and stem seals to potential damage from settling solids and exposes the DTR to potential accumulations.




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