BLACOH FLUID CONTROL |
SENTRY
hydro-pneumatic products are manufactured to the highest quality
standards in the largest variety of chemical resistant materials
available. Simplicity of the design includes only one moving
part, the bladder, a choice of air charging assemblies, and easy
in-line maintenance. Sentry products are engineered to a 4:1
pressure safety margin at ambient temperature and warranted for
materials and workmanship.
SENTRY PLASTICPressure Rating: up to
150 psi
Capacities: from 4 to 370 cubic inches
Shell Materials: Polypropylene, PVC, PVDF,
Acetal
Ports: Threaded- NPT & BSP, Flanged- ANSI
& DIN
SENTRY
METALPressure Rating: up to
3000 psi
Capacities: from 4 cubic inches to 100 gallons
Shell Materials: Mild Steel, 316 & 304 Stainless,
Alloy 20, Hastelloy C and Epoxy, PVDF and Teflon® coated steel.
Ports: Threaded- NPT & BSP Flanged- ANSI
& DIN
SENTRY SANITARYPressure Rating: up to
80 psi
Capacities: from 4 cubic inches to 4.8 gallons
Shell Materials: Mirror Polished 316 Stainless
Steel. Bead blasted (unpolished) 316 stainless steel food grade
units also available with sanitary fitted inlet ports.
Ports: Tri-Clamp type Sanitary fitted
SENTRY
PTFE TEFLON®Pressure Rating: up to
150 psi
Capacities: from 3 to 355 cubic inches
Shell Materials: Machined PTFE Teflon®
Bellows Material: Machined PTFE Teflon®
Ports: Threaded- NPT & BSP, Flanged- ANSI
& DIN, Flare type tube fittings (includes Teflon®
coated or all engineered plastics hardware).
The control of fluid dynamics is essential to ensure efficient and safe use of process systems. Uncontrolled fluid in motion can physically destroy a pumping system, including the pump, piping, valves, meters, back pressure valves, rupture disks and other in-line instrumentation and equipment.
A pump puts fluid in motion by adding energy to it. This kinetic energy, observed as pressure, is carried in the fluid and slowly lost into the piping system through friction. When the fluid in motion is quickly stopped or started, the kinetic energy is released in the form of a pressure spike; this occurs because fluids are not compressible and, therefore, transfer rather than absorb the shock of the sudden pressure change. This water hammer effect is similar to a hammer hitting a concrete wall - some energy goes into the wall, a little is lost to friction, but most goes back into the arm, vibrating the hammer out of hand.
Both positive displacement pumps and quick closing valves start and stop fluids that are in motion. Positive displacement pumps drive their pumping action by capturing a given amount of fluid in a chamber and pushing it out the pump's discharge. Each pump cycle includes a suction stroke during which fluid flow is stopped. The stroke rate of a pump can reach into the hundreds and even into the thousands per minute. This pumping action produces an acceleration / deceleration of the fluid, creating units of uncontrolled energy, resulting in PULSATION, observed as pressure spikes.
Quick closing valves start and stop large volumes of fluid in motion. The velocity, the volume, and the density of the fluid all add to the pressure spike created when the valve is shut and kinetic energy is released. Without any type of cushion to absorb the energy, a high pressure SURGE is created, traveling up to the speed of sound. This hydraulic shock travels as a compression wave back and forth through the entire pipe system until it is finally dissipated by friction or a system component fails.
The solution to the problems associated with fluid dynamics is found in Blacoh Fluid Control's line of SENTRY pulsation dampeners, surge suppressors, suction stabilizers, thermal expansion chambers, and auxiliary energy storage chambers. SENTRY controls the fluid energy by minimizing the pressure spikes, much as a shock absorber dampens and smoothes the ride of an automobile over an uneven road surface.
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