Chemical Engineering September 2020 - 14

Focus
Focus on Valves
GEMÜ
A new motorized control valve
for the semiconductor industry
The 2/2-way diaphragm globe valve
C53 iComLine (photo) was developed
for precise and demanding control applications
in semiconductor production.
The sealing concept of the valve
is based on the company's PD design,
with actuator and medium separated
by a regulating cone made of resistant
polytetrafluoroethylene (PTFE). As
the regulating cone contour, actuator
stroke and connection size can be
customized, the C53 iComLine satisfies
virtually all control and flow requirements
of the high-tech semiconductor
industry. Thanks to the combination of
the precise stepper motor with ultrapure
body materials, the valve is particularly
suitable for lithography, CMP
and etching processes, as well as applications
in the analysis field of any
semiconductor production process.
- GEMÜ Valves, Inc., Atlanta, Ga.
www.gemu-group.com
Posi-flate
Asahi/America
Stainless steel butterfly valve
seals with inflatable seat
The Posi-flate butterfly valve with a
highly polished 316 stainless-steel
housing and disc (photo) is suitable
for many applications, such as
food, chemical and pharmaceutical
manufacturing. The inflatable seat
design of this butterfly valve provides
a better seal by utilizing air pressure
to expand the seat against the disc,
providing more sealing area and an
even pressure distribution against the
disc every time. The seat automatically
compensates for wear when it
inflates against the disc, extending
valve life considerably. Because the
Posi-flate disc only makes casual
contact with the seat during opening
and closing, torque requirements
are substantially lower. The Posi-flate
stainless-steel butterfly valve is available
in sizes ranging from 2 to 20 in.
- Posi-flate, St. Paul, Minn.
www.posiflate.com
Cowan Dynamics
14
A new ball valve for
precision flow control
The Type-21a Seat Support Technology
(SST) flow-control ball valve
(photo) offers all of the robust elements
of the Type-21 and the ability to precisely
control flow. Available in ½- to
2-in. sizes, the SST ball valve features
a precision-machined polyvinylchloride
(PVC) ball with center provisions
to support PTFE seats from 0 to 100%
of capable flow. The Type-21a SST
ball valve produces equal-percentage
flow characteristics for fine throttling.
The valve requires directional installation
and comes equipped with a flowdirection
label. Manually operated SST
ball valves include a 0-to-100 deg indicator
plate and an indicator line on
the handle, which doubles as a carrier
adjustment tool. The valve body
is PVC with either EPDM (ethylene
propylene diene monomer) or FKM
(fluoroelastomer) O-rings. - Asahi/
America, Lawrence, Mass.
www.asahi-america.com
This new valve actuator takes
up less space
Launched in March, the E2HR Series
Electro-Hydraulic rotary valve actuators
(photo) are said to pack high performance
into the smallest possible
installation envelope for ¼-turn valveactuating
applications. All hydraulic
components and sensors are integrated
into a single compact manifold
block that also houses the actuator
and integral oil reservoir. The control
panel can be mounted directly to the
manifold block or installed remotely to
run multiple units from a single control
panel. This self-contained actuator
can be installed either vertically or
horizontally and has no external piping.
The actuator delivers a torque of
up to 300,000 in-lb, has a duty cycle
of 100% and can operate at temperatures
from -50 to 40°C. Partial-stroke
testing can be initiated from the touchscreen
or remotely. - Cowan Dynamics,
Inc., Montreal, Que., Canada
www.cowandynamics.com
Bellows seal valves for when
leakage is not an option
Low-pressure ASME Class 150900
Clampseal bellows seal valves
(photo, p. 15) are suitable for demanding
toxic, corrosive and caustic
applications, as well as regulation of
severe-service process control where
ChemiCal engineering www.Chemengonline.Com September 2020
http://www.asahi-america.com http://www.gemu-group.com http://www.cowandynamics.com http://www.posiflate.com http://www.Chemengonline.Com
Chemical Engineering September 2020

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