Cameron Demco User Manual
Butterfly-Style DEMCO Valves
Quality design and rugged dependability for rigorous industrial,
oilfield, and drilling applications
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Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Features and benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Styles and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Base part numbers and weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Marine series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Component parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Dimensional data (valves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Handles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Worm gear operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
General technical information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Torque data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Standard material data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Fire test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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Oklahoma City, Oklahoma, USA
Introduction
Cameron is a leading provider of valves, valve automation, and measurement systems to
the oil and gas industry. Our products are primarily used to control, direct, and measure
the flow of oil and gas as it is moved to refineries, petrochemical plants, and industrial
centers for processing.
We provide valve products that are sold through distributor networks
worldwide. Our products are used in oil and gas and industrial applications
and include widely recognized brands such as DEMCO* valves; NAVCO*
floating ball valves; NEWCO* gate, globe, and check valves; DOUGLAS
CHERO* forged-steel gate, globe, and check valves; NUTRON* ball
valves; TOM WHEATLEY* check valves; WHEATLEY* check valves; and
WKM* valves.
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Designed for dependable, heavy-duty performance in abrasive and
corrosive service conditions, butterfly-style DEMCO valves are commonly
selected for a number of oilfield applications, including drilling
and production.
Features and Benefits
As one of the most durable resilient-seated butterfly valves in the industry,
the Cameron butterfly-style DEMCO valve excels in a variety of applications.
Cast in both wafer and tapped lug patterns in a variety of material choices,
butterfly-style DEMCO valves feature a one-piece body for reduced weight
and increased strength.
The unique stem hole design in the disc ensures a dry stem journal. The
hard-backed seat enables ease of installation, reliable operation, and
infield repairability without special tools. Butterfly-style DEMCO valves are
available in sizes 2 to 36 in [50 to 900 mm].
Engineered for long-term, reduced-maintenance performance, butterflystyle DEMCO valves are commonly selected for a variety of applications
in the following industries:
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chemical and petrochemical
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agriculture
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oil and gas drilling and production
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food and beverage
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water and wastewater
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cooling towers (HVAC)
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power
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mining and materials
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dry bulk handling
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marine and government.
Bidirectional sealing
The butterfly-style DEMCO valve provides bidirectional sealing at full-rated
pressure with identical flow from either direction.
Integral flange seal
An integral flange seal molded into the edge of the seat accommodates
ASME weld neck, slip-on, threaded, socket, and stub-end type C flanges.
ASME Class 150 rating
With a body rating of American Society of Mechanical Engineers (ASME)
Class 150 (285-psi nonshock), the wafer body diameters are designed to
self-center in the ASME Class 150 flange pattern.
Flatted double "D" upper stem
Large-flange top for ease of
power automation
Bronze bearings
Positively oriented disc
Hard-backed cartridge seat
One-piece body
Positive stem retention
for blowout-proof stems
MSS SP-25
marking standard
Triple stem seal
High-flow disc
Wafer-style DEMCO valve.
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Features and Benefits
Multiple pressure ratings
Three drop-tight pressure ratings are offered for 2- to 12-in [50- to
300-mm] sizes. The standard shutoff pressure rating is 200 psi, but 285and 50-psi shutoff ratings are also available. A throttling 0-psi-rated valve
is available where drop-tight closure is not required and minimal torque is
desired. Both the 50-psi and throttling ratings allow for smaller actuators,
which can significantly reduce overall installation cost in automated
applications. The 14- to 36-in [350- to 900-mm] valves are available
in 150- and 285-psi drop-tight shutoff ratings.
Dry stem journal that reduces potential for leakage
The DEMCO valve’s disc is uniquely designed with a continuous annularraised band around the stem hole and disc edge, which presses flat into the
seat at every angular position.
The resilient seat presses back with a higher force than the line pressure,
preventing leakage to the stem. In addition, two O-ring ribs are provided
in the seat stem bore, creating a triple stem seal. In comparing stem
seal designs with boot seats, a seal is accomplished by an interference
squeezing on the stem or an O-ring in the stem journal. The potential for
leakage behind the seat is high for this type of design. As the disc wipes
the seat, elongation of the stem seal area enables leakage to collect behind
the seat. This condition is reduced by the DEMCO valve’s dry stem journal
and hard-backed seat.
Dry stem journal.
Hard-backed cartridge seat
The DEMCO valve’s cartridge seat is constructed by permanently bonding
a resilient elastomer to a rigid backing ring. In addition to superior sealing
integrity, this design
■
makes valve installation easier because no special precautions are
required for disc position, which is especially advantageous when
installing valves with fail-closed actuators
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reduces high torque and premature failure caused by elastomer
distortion, as found in other nonrigid seat designs
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simplifies seat replacement because the seat is slip-fitted into the body
with no need for special tools.
Hard-backed cartridge seat.
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Positively oriented disc
The rectangular drive ensures the proper orientation of the stem disc
connection. In 2- to 24-in [50- to 600-mm] size valves, the disc is permitted
to float on the stem to center in the valve seat. This design enhances
drop-tight sealing and prolongs service life.
End-of-line service
Lug body valves may be used in end-of-line service with downstream piping
removed. Only weld-neck or socket flanges can be used for this service.
Since upstream pressure is excluded between the flange and the seat face
by the DEMCO valve's flange seal design, there is no effective force to slide
the seat downstream. The 2- to 12-in [50- to 300-mm] lug butterfly-style
DEMCO valves are suitable for liquid service up to 200 psi with downstream
piping removed at 150 psi for 14- to 36-in [350- to 900-mm] valves.
Lug body valves are recommended for isolation of pumps, control devices,
or other system components, which may need to be removed for repair
or replacement. Lug valves also are suitable for installation at points
from which piping expansion may proceed. Such valves normally are
blanked with blind flanges to protect the exposed seats until new piping
is attached.
Features and Benefits
Disc
Stem
Positively oriented disc.
Design and testing specifications
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MSS SP-67 (testing is applicable upon request)
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MSS SP-25 (standard marking system for valves)
In addition, butterfly-style DEMCO valves can be supplied to comply
with these standards:
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ABS
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CE/PED
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CRN
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DNV
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EAC
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API Spec 607 4th Ed. fire test
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US Coast Guard 46 CFR 56.20.
End-of-line service.
Upstream Disc
Specifications
Specifications
Sizes, in [mm] 2 to 36 in [50 to 900 mm]
Body type and style designations Long-neck NE-C and NF-C 2- to 36-in [50- to 900-mm] wafer or lug
Short-neck NE-I 2- to 12-in [50- to 300-mm] wafer or lug
NE-D and NE-D SP 2- to 12-in [50- to 300-mm] wafer
Marine 2- to 36-in [50- to 900-mm] wafer or lug
Standard pressure rating, psi Standard Options
2 to 12 in [50 to 300 mm] 200 0 (throttling), 50, and 285
14 to 36 in [350 to 900 mm] 150 285
Operating temperatures, degF [degC] −30 to 300 [−34 to 149], depending on seat material selection and application (see page 26)
Standard material options Standard Options
Bodies Ductile iron Aluminum bronze, carbon steel, and SS
Discs Nickel-plated ductile iron, aluminum
bronze, and stainless steel (SS)
Stems 416 SS 316 SS
Seats Buna-N, FKM Ethylene propylene diene monomer (EPDM)
Note: Many more options available (consult Cameron or see pages 10, 11 and 12 on how to order).
Fire-safe API Spec 607 4th Edition, CRN, ABS, DNV, EAC, and PED certifications on selected sizes and pressure rating.
ZPEX® coated ductile iron (see note)
and natural rubber
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Styles and Accessories
Butterfly-style DEMCO valves come in a variety of styles to suit a range
of applications. In addition, a variety of quality accessories are available
to further enhance its suitability to the application.
Series NE-C
Sizes 2 to 12 in [50 to 300 mm] are available in both wafer and lug styles.
This series is a general-purpose valve with a neck length designed to
provide full clearance for the valve top over 2 in of insulation on ASME
Class 150 pipe flanges.
Series NE-I
Sizes 2 to 12 in [50 to 300 mm] are suited for a range of applications
in many industries, including food and beverage, utilities, and process
flowlines. This short neck design is offered in a variety of body materials.
The valves are designed for installation between ASME Class 125 and
150 flanges.
Series NE-D
The valves in this series can be made in sizes 2 to 12 in [50 to 300 mm].
The Series NE-D valve is a short-neck valve with body notches to fit
popular, lightweight flange patterns, making it ideal for both the bulk
material handling and the transportation industries. Valves also will center
in ASME Class 125 and 150 flanges.
The valves are designed for installation between ASME Class 125 and
150 flanges. The Series NE-D valve is also available with the short-pattern
version (NE-D SP).
Series NF-C
Sizes 14 to 36 in [350 to 900 mm] are available in both wafer and lug styles.
The wafer body has two drilled locator lugs at the top and bottom for ASME
Class 150 flanges. Bronze bearings are installed on both stems for reduced
operating torque.
Series NE-C lug 6 in [150 mm].
Series NE-C wafer 6 in [150 mm].
Series NE-I lug 8 in [200 mm].
Series NE-I wafer 3 in [80 mm].
Series NF-C lug 16 in [400 mm].
Also available in wafer style (not shown).
Series NE-D wafer 4 in [100 mm].
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Marine
Butterfly-style DEMCO valves for marine applications are available
in the NE-C lug, NE-I lug and wafer, NE-D wafer, and NF-C lug
styles and conform to
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Title 46 of the Code of Federal Regulations
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Part 56 of the US Coast Guard’s Marine Engineering Regulations
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US Coast Guard Category (A) Acceptance on API Spec 607
qualified valves
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American Bureau of Shipping Standard, including tagging per
MSS SP-25 and testing per MSS SP-67.
Actuators
Consult Cameron or visit cameron.slb.com/valves for actuation options.
Handles and stem extensions
There are three basic handle designs that are compatible with any 2- to 12-in
[50- to 300-mm] valve: ten-position locking, two-position locking, and
memory stop. Memory-stop handles provide throttling, which is infinitely
adjustable and can be set by a lock nut with a memory-stop setting
(adjustable open stop). Handles are available in basic trim, corrosionresistant trim, and sanitary trim. Please consult Cameron for information
on stem extension.
Styles and Accessories
DEMCO valve with actuator.
Gear operators
DEMCO valve weatherproof gear operators are offered with a choice of
handwheel. The worm gear has either self-locking set screws to control
open and closed positioning or an optional adjustable memory-stop for
balance return to a preset open position after closing.
DYNATORQUE* valve accessories gear box.
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