CONTROL VALVES AND ACCESSORIES - SIZING & SELECTION
This discussion will focus on proper sizing and selection of Control Valves with accessories for incompressible and compressible fluids. Today there is little excuse for poor specification and selection of Control Valve as most valves manufacturers provide computer programmers for selection and sizing.
The days of selecting Control Valves based on pipe line sizes are gone for ever as adequate details are today available to gain an understanding on its theory, supportive experimentation and control requirements.
To get a basic understanding on the theory and Calculations, reference can be made to Masoneilan Control Valve sizing. In the following pages, an attempt has been made to explain the procedure (Step-by Step) to be followed to select the right valves. Subsequently, additional details are given on special design considerations, viz., critical flow, critical flow factor, cavitations, flashing, valve noise etc
CONTROL VALVE SPECIFICATION CHECKLIST
| REQUIRED FLOW PARAMETERS | LIQ | GAS | STEAM |
| P1 Bar a | X | X | X |
| P2 Bar a | X | X | X |
| Flow (Min. Nor and/or Max) | X | X | X |
| Gf (at flowing temp.) | X | - | - |
| G (at 60 Degree F) | - | X | - |
| T (Degree C) | - | X | - |
| Pv bar a | X | - | - |
| P Shut off kg/cm2 | X | X | X |
| Downstream Pipe size (mm) | X | X | X |
| Downstream Pipe Schedule | X | X | X |
| P1 - Inlet Pressure P2 - Outlet Pressure G - Specific Gravity T - Temperature Pv - Vapour Pressure Gf - Specific Gravity at flowing temp. |
|||
This is default description text on Padangan Themes, of course you can change this text via you profile administration.
August 10th, 2007 at 12:04 pm
Design V150 Vee-Ball® Control Valve
Design V150 is a single flange valve for throttling or on-off operation for many different applications in the process industries. The V150 is available in NPS 1 through 20, CL150 (DN 25 through 300, PN 10/16). Trim components are interchangeable between Design V150, V200 and V300.
Design V200 Vee-Ball
Design V200 is a flangeless valve for throttling or on-off operation for many different applications in the process industries. The V200 is available in NPS 1 through 10, CL150, CL300 or CL600. Trim components are interchangeable between Design V150, V200 and V300.
Design V300 is a double flange valve for throttling or on-off operation for many different applications in the process industries. The V300 is available in NPS 1 through 16, CL300 (DN 25 through 100, PN 15/40). Trim components are interchangeable between Design V150, V200 and V300.
Eccentric Plug Valves-
Design CV500 eplug™ Control Valve
Design CV500 is a flanged or flangeless eccentric plug valve valve with reversible metal seat ring and splined shaft. Design CV500 is available in NPS 3 through 12 (DN 80 through 300) , CL150/300/600 (PN 10 through PN 100). The camming of the ball permits high capacity flow, and the valve body (being similar to the V500) gives it rugged strength.
Design V500 eplug™ Control Valve
Design V500 is a flanged or flangeless eccentric plug valve with reversible metal or ceramic seat ring and splined shaft. Design V500 is available in NPS 1 through 8 (flangeless available only in NPS 3 through 8), CL150/300/600 (PN 10/100) (NPS 3 through 8), CL300 (PN25/40). This valve is for use in heavy slurry or corrosive applications.
The V250 is a flangeless, reduced bore ball valve in NPS 4 through NPS 24 and compatible with CL600 or CL900 for heavy duty (high temp or tight shutoff) throttling or on/off applications.
The V260 is a flanged full ball valve in NPS 8 through 16 and compatible with CL300 or 600 for high capacity process applications. The V260 can be ordered with Aerodome™ or Hydrodome™ attenuators for noise reduction.
High Performance Butterfly Valves - Throttling Control-
Type 8560 is a high-performance butterfly valve with a splined shaft for throttling control. The Type 8560 is available in NPS 2 through 12, CL150 and CL300. With a flangeless (wafer) or single flange body and wide variety of seals, it can be used in most industry applications. The NPS 2 valve is multi-rated to CL150/300/600.
Type 8532 edisc® Control Valve
Type 8532 is a high-performance butterfly valve with a splined shaft for throttling control. This valve is available in NPS 14 through 24, CL150 and CL300. With a flangeless or single flange body and wide variety of seals, it can be used in most industry applications.
Additional Product Information
Type 8510B is a multi-class rated flangeless valve for throttling control. The 8510B valve is available in NPS 2 through 12, CL150, CL300 and CL600 (PN 10 through PN 100 compatible). Type 8510B is available with a splined shaft or a double D shaft. Type 8510 is a flangeless valve, with a splined shaft for throttling control. Type 8510 is available in NPS 14 through 24, CL150 (PN 10 and PN 16 compatible). These valves feature an eccentrically mounted disk and a PTFE or 316 stainless steel seal ring.
World area note: These valves are manufactured in Europe to comply with both ANSI and DIN requirements. It is not readily available in North America where DIN requirements are unusual.
Type A41 is a high-performance butterfly featuring a double D shaft for on-off service. Type A41 is available in NPS 2 through 12, CL150 and CL300. The NPS 2 valve is multi-rated to CL150/300/600. Type A41, along with Type 1035 Rack and Pinion Actuator is part of the POSI-SEAL Package.
Type A31A POSI-SEAL® Control Valve
Type A31A is a high-performance butterfly valve featuring a keyed shaft for on-off service. Type A31A is available in NPS 14 through 24, CL150 and CL300. This valve is available in either a flangeless wafer-style design, or a single-flange (lugged) body. The Cryogenic version (see color picture) of this valve is available in NPS 3 through 24.
Type A11 is a high-performance butterfly valve featuring a keyed or square-end shaft for various on-off applications. Type A11 is available in NPS 3 through 24, CL600 (both keyed and square-end shafts), and NPS 30 through 48, CL150/150, CL150 and CL300. This valve is available in either a flangeless (wafer) style, or a single-flanges (lugged style).
Fisher provides butterfly valve solutions for unique applications. Contact your local sales office for more details.
Typical Capabilities
* CL600 and above with splined shaft
* Cryogenic / extension valves (NPS 3 to 54 up to CL900).
* Erosive / Corrosive service valves (e.g.: slurry service).
* Fire sentry actuator special designs
* Geothermal application valves.
* High Pressure CL150/150 up to CL2500.
* High pressure (CL600, 900, 1500) Class 5 metal seal designs.
* Inlayed T-slots
* Large size butterfly valves to NPS 96
* Noise attenuation
* Nuclear Service
* Restricted or derated trim valves (e.g.: CL2500 with CL300 trim, NPS 24 valve with NPS 20 trim …)
* Ring type joints
* Special alloys
* Spray on coatings
* Special face to face
* Special flanges (API, DIN, AWWA, butt weld end)
* Special mounting of non-Fisher actuators on Fisher valves
* Steam/heat traced body and disc
* Swing through valves (A11/A41/8560/8532)
* Tandem linkage designs.
Specific Examples
CL150/150 - 2500
NPS 10 CL1500, model A11 w/ piston actuator
Corrosive Service
NPS 6 Slurry valve. For applications seeing heavy erosion, scale formation and plugging.
Cryogenic Valves
NPS 3 CL150 model A31C cryogenic valve with special bootseal. For oxygen service, 200° F @ 100 psi.
Tandem Linkage
Model A31A with Fisher diaphragm actuator.
Media: Steam, 730°F @ 1115 psi.
Special Tandem Linkage
Large Butterfly Valves
NPS 72 model A11 with gear actuator
Restricted or Derated Valves
Model A11, NPS 24 x 20 x 18 CL2500, CL300 internals and weld end flanges.
Media: Ammonia, 960° F @ 1620 psi.
Special Coatings
K-Mass coating for high temperature applications.
Steam / Heat Traced Body and Disc
NPS 42 CL300, model A11 with steam trace.
Media: Tail gas, 275 - 440° F @ 5 psi.
Special Flanges
Model A11 large extension valve with weld end flanges
Special Alloys
NPS 14 CL300 model A31D, double flange. Safety shutdown vlv. Materials: monel, alloy 20. Media Vinyl Chloride Monomer, 450° F @ 1330 psig.
Special Flanges
NPS 36 CL300 model A31D double flange, with 1061 actuator
Return to Top
Rotary Specials-
Ball Valves
Fisher provides ball valve solutions for unique applications. Contact your local sales office for more details.
Typical Capabilities
* Butt weld end valves
* Design class extension (e.g.: NPS 20 V300, NPS 24 V150/300)
* Extension valve designs
* Geothermal applications
* Noise abatement
* Reduced bore valves
* Restricted trim valves (e.g.: NPS 20 V300 with CL150 internals)
* Severe service coatings
* Special ASME class
* Special face to face
* Special flanges (API, AWWA, DIN)
* Special mounting of non-Fisher actuators on Fisher valves
* Special seal packages (e.g.: Hi-temp, HD seals)
* Special shutoff capability
* Steam jackets
Specific Examples
Model V260
NPS 12 CL900 model V260
Buried Service Valve
NPS 20 V250 with 6′ extension
Media: Natural gas @ 700 psig
Special Features
NPS 24 V150 with 20″ internals and an aspiration tube.
(Click on picture to see aspiration tube)
V300
NPS 20 V300 with Fisher 1061 actuator.
Media: Air, 290° F @ 532 psig.
September 15th, 2007 at 7:58 pm
I have a valve design that has pressure/temperature ratings per B16.34. The valve is not designed per B16.34, but it is a proprietary design at B16.34 pressure / temperature ratings. Marketing wants to call it a “ANSI Class 150 Valve”. Does this imply that the valve is made to B16.34 or that the valve is rated at ANSI Class 150 pressure/temperature ratings?
Also, where did the ANSI Class designations come from. I know they are listed in B16.34, B16.5 and B16.47, but were they originally developed in another standard? Does anyone know of a standard that defines the Class designations? I found some thread on here that imply that the Class designations originated in the Boiler and Pressure Vessel Code. Does anyone have any insight on these two subjects?
September 15th, 2007 at 7:58 pm
I am still finding difficulty determining what an ANSI/ASME Class 150 valve is. My interpretation is that ANSI/ASME Class 150 refers to a pressure / temperature rating. This does not implicitly indicate that the valve is made to ASME b16.34. If the valve is made to ASME b16.34, then I would call it an ASME B16.34 valve. I am being pushed to make a decision on the semantics of this problem, but I cannot find any documentation to solidly support either side of the story.
Some of my co-workers believe that calling the valve an ANSI Class 150 implies that it is an ASME B16.34 valve. If I look at MSS SP-25 (Standard Marking System for Valves, Fittings, Flanges, and Unions) section 4.1, Rating Designation, I see: “The expression “Rating Designation” includes the intent of the expressions “Pressure Designation”, “Service Designation”, “Pressure Class”, and similar terms used to define the pressure/fluid/materials temperature limitation of the product.” 4.1.1 further details Class as a rating designation: “The Rating Designation for products may be designated by the class numbers alone, e.g., a steam pressure rating or a pressure class designation.” Is this valid documentation to support that Class 150 is a material/pressure/temperature rating designation?
Perhaps a better question is: What is the difference between an ANSI/ASME Class 150 Valve and an ANSI/ASME B16.34 Valve?
JLSeagul, I am feeling your insanity! This should be a simple subject with a simple answer… I am not the sharpest tack in the bunch, but I am by far not the dullest. There has to be something I am not seeing…
September 15th, 2007 at 7:59 pm
If you use the terms ANSI or ASME class 150, you are exposing you company to a lawsuit. Whether intentional or not, for valves, it implies compliance with B16.34. Compliance with pressure vessel codes is the law in many states, and the codes refer to B16.34 as a governing standard for valves. It is the primary standard for valves in North America and much of the world. You must be very clear it what you are trying to tell your customer in stating “ANSI Class 150″. If in anyway your marking can be considered intentionally deceitful, you are at legal risk. If someone misinterprets your marking, installs it in a code class plant, and there is a problem, there are legal implications. This is just my opinion as full compliance with B16.34 requires marking with the term “B16.34″. B16.34 not only cover the pressure temperature ratings, but wall thicknesses, safety features, testing, marking, material, end connection dimensions, bolting, and more.