NEW PRODUCTS
Large Diameter Butterfly Valves
GF Piping Systems has introduced the new Type 567 Butterfly Valve in large diameter sizes up to 12 inches. The
new corrosion-resistant valve incorporates a double-eccentric operating principle that provides improved
wear and easier operation over traditional eccentric-style
butterfly valves.
Key to the valve’s double-eccentric disk design is the
off-center shaft that allows the disc to completely disengage from the disc seal, even when partially open. This
reduces seal friction and improves seal wear characteristics, resulting in longer service life, minimal maintenance
and better protection against pressure surges. The double-eccentric design also lowers the torque required to operate
the valve, making for easy manual operation and use of
smaller actuators at a significantly reduced cost.
Typical applications include industrial water treatment, potable water treatment, swimming pools, water
parks and waste water systems in such industries as
chemical, chemical distribution, electroplating and power
plants.
CIRCLE READER SERVICE #10
Curved Bill Check Valve
The Curved Bill Tideflex TF- 1 Check Valve is designed to
enhance sealing, especially in low-lying areas with little back-pressure. The valve is constructed entirely of rubber, making
it virtually immune to rust, corrosion and weathering.
The curved bill of the TF- 1 seals without backpressure,
allowing for a tighter seal that eliminates gapping issues. The
flexible bill also seals around entrapped debris. The headloss
of the valve remains exceptionally low. It also has a strong
spring steel spine, enabling it to handle long-term water
weight. The spine is at a greater vertical angle, making the
TF- 1 able to withstand the cantilever effect when water is
flowing through the valve.
Applications include hig hway runoff,
flood control CSO/SSO systems,
site drainage, stormwater
discharge, sewer systems,
coastal discharges, odor
control or any application
requiring backflow prevention.
CIRCLE READER SERVICE #167
CASE STUDY:
Double Block-and-Bleed Ball Valves Enhance Safety in Texas Refinery
A major oil refinery in Texas was looking to
optimize isolation of process flow
measurement instrumentation on a FCC
(fluid catalytic cracking) unit. The flow
measurement design used a solid wedge
meter, which is a section of pipe containing
a weir that creates an obstruction of flow,
causing a change in line pressure between
the upstream and downstream side of the
weir. By measuring the difference in
upstream and downstream pressures using a
differential pressure transmitter, the flow rate of the
product can be calculated.
The process flow stream, which can reach temperatures near 720º F, contains abrasive carbon solids and
fines. Traditionally, a multi-turn rising stem valve was
used on each side of the weir to isolate the pressure tap
on the wedge meter and the input to the pressure transmitter. The multi-turn valves over time struggled to provide tight shutoff due to the build-up of carbon grit and
fines in the seat and packing area. Tight shutoff is critical
to safety when the need arises to isolate instruments for
IMAGE BY DIANE YEAGERS, PBM
repair or replacement from the high-temperature process flow stream.
PBM Inc. offered a fast operating, quar-
ter-turn, double block-and-bleed ball valve—
critical if a leak or instrument failure
required a quick shutoff. PBM’s 2-inch full-
bore, 300# flanged, double block-and-bleed
valves installed on each side of the weir
could handle the abrasive process fluid at
elevated temperatures and provide a tight
shutoff. These double block-and-bleed, sin-
gle-bodied valves contained two ball valves in a single
body with a bleed port to permit release trapped process
fluid between the two balls. The use of two valves in a
single body provided a redundant safety feature. In the
event one valve failed, the other would continue sealing
against the process flow. With both valves closed, the
bleed permits dissipation of process fluid trapped in the
small cavity between valves. Extended locking lever han-
dles were used to allow for insulation clearance.
For more information, visit www.pbmvalve.com
or circle Reader Service #40.
