Flexgate Slurry Knifegates
are Designed for Heavy-Duty Use
Flexgate Slurry Knifegate Valve
for difficult abrasive slurry service
elastomer cartridge seats
150-psi stainless steel gate
Materials of Construction
Iron Body to 24"
Steel Body over 24"
304SS or 316SS body
ASTM A240 T-316
17-4 Ph, Hastelloy C, or Teflon coated 316 Stainless Steel
sleeves: Pure Gum Rubber, Buna-N, EPDM, and Viton.
Flexgate valve is designed with a cast iron body or fabricated steel body, stainless
steel gate, and two heavy-duty elastomer cartridge slurry seats. The port is
formed by two heavy duty
cartridge elastomer slurry seat halves. The cartridge slurry seats are available in various
elastomers for chemical
compatibility and abrasion resistance. A flush area at the valve's base provides a
clean-out port. The
Flexgate valve provides bi-directional shutoff. A heavy-duty topworks is
The relatively simple design eliminates
expensive overhauls, unscheduled shutdowns, and costly replacement parts - the only
replacement parts are the slurry
sleeves and the packing. Flexgate
valves of 3"-12" are provided with standard handwheel mechanisms featuring cast
handwheels, machined 303
stainless steel stems with yoke sleeves, and thrust washers designed to reduce operating
torque. It is recommended
that Manual Flexgate Valves 12" and larger be specified with a 4:1 bevel gear
actuator. The 4:1 bevel gear actuator
is available to reduce rim pull and operate the valve. Pneumatic actuators are also
available, and allow the Flexgate to provide long-term abrasion resistance under high cycle
valve self-cleans each time it is cycled, making it ideal for automated plants. Red Valve manufactures its actuators
using black Amalgon, a fiberglass
reinforced epoxy resin. The actuator material is inert to most corrosive chemicals,
hydraulic fluids, water, and oil.
It has an operating temperature range from -90°
to 225° F, and can
withstand maximum working pressures of 250 psi. Inside actuator walls are polished
and impregnated with a moly-disulfide
for reduced friction and wear. The piston seal is a long-lasting O-ring. The piston rod is sealed with
a lip seal, which is
protected by a rod wiper ring. This wiper ring prevents dirt from being dragged though the seal.
Red Valve's Flexgate Valves are also available with hydraulic or electric actuators. Other options
include limit switches, solenoids,
air regulators, and chainwheels.