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产品名称:
美国 BRAY 博雷 20/21系列
产品型号:
SERIES 20/21
产品展商:
上海宏钲机械设备有限公司
简单介绍
SERIES 20/21Sanitary and ChemicalResilient SeatedWafer/Lug 1"-20" (25mm - 500mm)
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美国 BRAY 博雷 20/21系列
的详细介绍 |
series 20/21 Wafer/Lug
butterfly valves
2"- 20" (50mm-500mm)
PTFE & ELASTOMER MOLDED DISCS & SEATS
Ptfe
2"–12" (50mm–300mm)
Bray. Controls offers a line of
butterfly valves with PTFE
molded discs and seats. This
special line of valves has all
the design features of the
standard resilient seated Bray Series 20/21 valve, plus thespecific advantage of PTFE for use in corrosive environments. Oneimportant design feature is the one-piece DISC/STEM. This designprovides complete protection from particle entrapment and bacterialdecay. The thin disc profile allows a high Cv rating.
The BODY is two-piece wafer or lug style. Standard bodies are Nylon11 coated for excellent corrosion resistance.
Extended NECK length allows for a minimum of 2" of pipinginsulation.
FLANGE LOCATING HOLES provide quick and proper alignment duringinstal-lation, thus allowing the installer to center the valve inthe pipeline between the flanges.
BRAY’S UNIQUE SEAT DESIGN is one of the valve’s key elements. Theelastomer backed PTFE seat features a tongue and groove retentionmethod which holds securely between either slip-on or weld-neckflanges and also allows simple and fast field replacement. ThisEPDM backing provides resilient support for the molded PTFE, thusmaxi-mizing the shut-off and cycle life of the seat.
Seat cross-section at stem hole.
PTFE is precisely molded at the seat stem holes into a sphericalshape to match the curvature of the disc/stem hubs. Uniformdistribution of contact pressure between the disc/stem and the seathub produces a superior primary stem seal, reduces torque andenhances the sealing and service life of the valve. Additionally, acrown molded on the center of the seat elastomer back up increasesthe seat compression over the disc/stem when in the closedposition. This compression increases valve sealing whilemaintaining low seating/unseating torque.
BrAY 2-WAY seAL
(1)The primary seal is achieved by a PTFE to PTFE interference fitbetween the seat flat and disc hub. (2)The secondary seal is aninterference fit due to the diameter of the 17-4 ph stainless steelstem being larger than the diameter of the PTFE seat’s stem hole.These seals combine to completely isolate the seat’s elastomersupport material from the corrosive line media.
For a more detailed description of the many features of this valveplease refer to Bray brochure B-1001.
PTFe ADVANTAGes
PTFE is a superior material for use in highly corrosiveapplications. It is inert to most chemicals at high temperaturesand pressures, and PTFE also has a low coefficient of friction.Bray has combined these properties with the excellent features ofour Series 20/21 valve. PTFE is molded 1/8" thick to the 17-4 phStainless Steel disc/stem and 1/16" thick to the resilientelastomer seat. This insures that all components that come incontact with the line media are PTFE, thus providing maximumcorrosion protection.
The PTFE molded Series 20/21 is the ideal valve to use in theChemical Industry, in processes with hazardous fluids, in the Food& Beverage Industry, Pharmaceutical facilities, electronicsproduc-tion plants and many other industries where the media mustnot contact any organic or metallic materials.
elastOMer
2"–20" (50mm–500mm)
This is a special version of the Series 20/21 valve. In addition tothe design features of the Series 20/21, this valve has a elastomermolded disc. The elastomer material molded to the 17-4 ph StainlessSteel disc/ stem is either EPDM, Buna-N, or FKM* — all excellentchoices for severely abrasive and chemically erosive applications.Typical applica-tions are slurry services in Mining, Power,Chemical, Bulk Handling and many other industries. The thin profileof the one-piece disc/stem greatly
reduces the surface area of the disc, thus allowing for a muchhigher Cvthan most through-stem designs. Bray molds a 1/8" thick,long lasting elastomer material to the disc/stem. The naturalability of the elastomer surface to repel solids prevents in-lineparticles from damaging the disc, thus greatly extending the lifeof the valve. The molded disc/stem, combined with an elastomerseat, completely isolates any metallic materials from contact witherosive line media.
DesiGN FeATUres
Bray’s Series 20 valve is a wafer version with flange locatingholes, and the Series 21 is the companion lug version for dead-endservice and other flange requirements. All Bray valves are testedto 110% of full pressure rating before shipment.
A major design advantage of the Bray product line is internationalcompatibility. The same valve is compatible with most
world flange standards – ANSI Class 125/150, BS 10 Tables D and E,BS 4504 NP10/16, DIN ND 10/16, AS 2129 and
JIS 10. In addition the valves are designed
to comply with ISO 5752 face to face and ISO 5211 actuator mountingflanges.
Therefore, one valve design can be used in many different worldmarkets.
Bray interchangeability and compati-bility offers you the best inuniformity of products and low-cost performance in the industrytoday.
NYLON 11 COATiNG COrrOsiON PrOTeCTiON Bray’s standard product
offers valve bodies 2"-8" (50mm-200mm)
with a Nylon 11 coating, providing excellent corrosion and wearresistance to the valve’s
exterior surface – the weakest part of most
metal components. Valve sizes 10"-20" can be provided with Nylon 11coating in lieu of the standard Polyester coating with a priceadder – please consult factory.
This external protection is of special importance in severelycorrosive applica-tions because no metal is exposed to spillage orharmful chemical environ-ments. Nylon 11 is inert to fungus growthand molds, and it is USDA approved; thus, Nylon 11 is excellent forsanitary applications.
For a more detailed description of the advantages of Nylon 11 seeBray Technical Bulletin No. 1009.
PressUre rATiNGs
For bi-directional bubble-tight shut off,
disc in closed position:
17-4 ph SS Disc/Stem & PTFE Molded Seat
2"-12" (50mm-300mm) 150 psi (10 bar)
PTFE Molded Disc & Seat
2"-12" (50mm-300mm) 100 psi (7 bar)
Elastomer Coated Disc & Elastomer Seat
2"-20" (50mm-500mm) 150 psi (10 bar)
For Dead-end Service Applications:
With downstream flanges installed, the dead-end pressure ratingsare equal to valves bi-directional ratings as stated above.
With no downstream flanges, the dead-end pressure ratings for2"-12" valves is 75 psi (5 bar) for 14"-20" valves, 50 psi (3.5bar).
MATeriALs seLeCTiON
2"–20" (50mm–500mm)
BODY:
.
Cast Iron ASTM A126 Class B
.
316 Stainless Steel ASTM A351 CF8M
.
Ductile Iron ASTM A395 (Lug only)
.
Aluminum ASTM B26 Class B (Wafer only)
seAT:
.
PTFE-Lined EPDM
.
EPDM – Food Grade
.
Buna-N – Food Grade
.
FKM*
DisC/sTeM:
PTFE Molded
. PTFE molded over 17-4 ph Stainless Steel per ASTM
A747 Type CB7Cu-1 Heat Treated
Rubber Molded
2"-12" Material molded over One Piece Stainless Steel insert(Investment Cast)
. EPDM – 17-4 ph Stainless Steel per ASTM A747
Type CB7Cu-1 Heat Treated
. Buna-N – 17-4 ph Stainless Steel per ASTM A747
Type CB7Cu-1 Heat Treated
14"-20" Material molded over Stainless Steel insert (Fabricated)
.
Disc EPDM – 316 Stainless Steel per ASTM A240 Stem EPDM – 17-4 phStainless Steel per ASTM A564 Type 630 Heat Treated
.
Disc Buna-N – 316 Stainless Steel per ASTM A240 Stem Buna-N – 17-4ph Stainless Steel per ASTM A564 Type 630 Heat Treated
OTHer DisC COATiNGs
.
Nylon 11 USDA approved and FDA compliance
.
Halar. – for abrasive applications where PTFE is
not suitable
TeMPerATUre rANGe OF seATs
Type Maximum Minimum
EPDM +250°F(121°C) -40°F(-40°C)
Buna-N +212°F(100°C) 0°F(-18°C)
FKM* +400°F(204°C) 0°F(-18°C)
PTFE-Lined EPDM +250°F(121°C) -20°F(-29°C)
*FKM is the ASTM D1418 designation for Fluorinated HydrocarbonElastomers (also called Fluoroelastomers). Halar. is a registeredtrademark of Ausimont U.S.A., Inc.
For electrical operation of pneumatic actuator on-off
functions, Bray 4-Way Series 63 solenoids are direct-mounted
to the actuator by NAMUR interface, with no external tubingrequired. Both waterproof (NEMA4) and explosion proof
(NEMA 4,7,9) housings are standard. NPT and IP65 DIN
connections are offered with
both single and dual coils. The air supply connection is 1/4" NPTand the electrical connection is 1/2" NPT. A manual override leveris located on the top of the
valve body. A 3-Way Solenoid and a Series 55 speed control thatallows independent
control of speed in both directions of actuator travel are alsoavailable.
series 6A eLeCTrO-PNeUMATiC POsiTiONers
Series 6A intelligent electro-pneumatic positioners offer precise,microprocessor driven flow control and advanced com-municationcombined with the lowest air consumption on the market. For usewith either double or single acting actuators, Series 6Apositioners can accept an analog 4-20 mA, HART, Foundation Fieldbusor Profibus PA input signal. Features include an LCD display,keypad, auto calibration and adaptive control. Both waterproof(NEMA4,4X) and explosion proof
(NEMA 4,4X,7,9) housings are available.
DISTRIBUTOR
The Bray 2N1 ProxSensor provides 2 proximity sensors in 1self-contained, fully sealed, compact enclosure. The sensors arecompletely encapsulated with epoxy resin in a polymer enclosure forsuperior moisture, chemical and corrosion protection. AC, DC,Intrinsically Safe and BUS Network versions are offered. Featuresinclude LED indicators, high visibility pointer for local positionindication, non-magnetic targets and multi-pin electrical cableconnector. A Valve Position Display is available as an
option. AC Sensor units operate on 20-250
VAC with a maximum load current of
500mA. DC Sensor units operate on 10-30VDC with a maximum loadcurrent
of 200mA. BUS Network powered units with solenoid drive are AS-i,DeviceNet and PROFIBUS DP.
DireCT-MOUNTiNG OF ACTUATOrs TO VALVes
Due to a modular concept of design, all Bray handles, manual gearoperators, and pneumatic or electric actuators mount directly toBray valves. No brackets or adapters are required. This allows forsimple installation in the field and minimizes possiblemisalignment.
PNeUMATiC ACTUATOr series 92/93
Bray actuators are rack and pinion, opposed-piston actuatorsavailable in two versions: double acting and spring return. Theyhave a maximum pressure rating of 140 psi (10 bar) and atemperature range
of -40°F (-40°C) to +200°F (+95°C).
Features include integral porting, travel stop adjustments, NAMURinterface, and acetal piston guides and rings which have a very lowcoefficient of friction and absorb the side thrusts of the pistons.Our spring return unit is designed with the housing length the samesize as our double acting unit, and spring cartridges areinherently safe.
All statements, technical information, and recom-mendations in thisbulletin are for general use only. Consult Bray representatives orfactory for the
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