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Blacoh Sentry Pulsation & Surge Control

Blacoh Sentry Pulsation Dampeners

Remove up to 99% of System Shock

Positive Displacement (PD) pumps create pulsation and hydraulic shock due to the reciprocating nature of their stroking action, potentially damaging piping and system components.

SENTRY® Pulsation Dampeners and Surge Suppressors remove virtually all system shock, enhancing the performance and reliability of fluid flow in municipal, industrial, sanitary and chemical transfer applications.

Sentry Pulsation Dampeners
Sentry Pulsation Dampeners
Available in a variety of sizes and chemically resistant materials
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How Sentry Works

SENTRY Pulsation Dampeners use a compressed gas separated by a bladder from the process fluid like a shock absorber. During the pump's discharge stroke, fluid pressure displaces the bladder, compressing the trapped gas. During the pump's next cycle, fluid flow stops momentarily causing expansion of the compressed gas, forcing the bladder to push accumulated fluid back into the discharge line. This fills the void created by cycle shift and dampens pulsation up to 99%.

Protect Pumps, Valves and Instrumentation
  • Protects pumps, piping, valves, fittings, meters and in-line instrumentation from damaging pulsations, cavitation, thermal expansion, hydraulic shock and water hammer.
  • Prevent destructive pressure surges caused by pump startup and shutdown.
  • Prevent hydraulic shock resulting from emergency valve closure and other equipment shutdown.
  • Prevent agitation, foaming, splashing and degradation of product.
  • Ensure accuracy, longevity and repeatability of flow meters and gauges.
  • Ensure a smooth, steady flow in metering and chemical injection processes.
  • Ensure uniform and continuous application in spraying and coating processes.
  • Ensure proper measurement, flow and filling applications of food and pharmaceutical products.
  • Ensure consistent flow when dosing, blending or proportioning process additives.
  • Ensure a smooth transfer of viscous or abrasive fluids.
Protect Inlet System Components

Positive displacement pumps contain an inlet valve that alternately opens and closes, creating an acceleration and deceleration of fluid into the pump. Sentry Inlet Stabilizers minimize these pressure fluctuations and acceleration head losses by preventing fluid column separation at the pump's inlet. The patented* "J" Model air control allows for pressure or vacuum settings and is adjustable for suction lift or positive inlet pump conditions.

  • Protect pumps, valves, diaphragms and pistons from excess stress and strain.
  • Protect inlet system components from vibration and fatigue.
  • Prevent premature system component failure and cavitation.
  • Prevent gauge damage due to vibration.
  • Ensure steady inlet flow conditions to extend diaphragm life.
  • Ensure complete chamber fill to maximize component service life.
  • Ensure accuracy of inlet side gauges.
Technical Specifications

Sentry Pulsation Dampeners, Surge Suppressors and Inlet Stabilizers come in a full range of chemically resistant materials for even the most corrosive applications. The simple, reliable design allows for quick installation and easy in-line maintenance. All Sentry housings are made in the USA, and each unit is tested at design pressure or higher to assure proper function and leak-free operation.

  • Positive displacement pump discharge sizes from 0.125" to 6" (3.18mm to 152.4mm)
  • Temperature ranges from -60°F to +400°F (-51°C to +204°C)
  • Pressure ranges up to 4,000 psi (276 bar)
  • Custom models available up to 100 gallons (378.5L) and 25,000 psi (1,724 bar)
  • Sanitary and flow-through models available for biotech, pharmaceutical and food industries
  Specifications – Sentry Plastic
Maximum Pressure: 250 psi (17.2 bar)
Temperature Range: -20°F to +250°F (-29°C to +121°C)
Capacities: 4 cubic inches to 5 gallons (0.066 L - 18.0 L)
Inlet Ports: Threaded: FNPT, BSP
Flanged: ANSI, DIN, Socket
Materials: Polypropylene, Conductive Polypropylene
Conductive Acetal
  Specifications – Sentry Metal
Maximum Pressure: 300 psi (20.7 bar)
Temperature Range: -60°F to +400°F (-51°C to +204°C)
Capacities: 4 cubic inches to 100 gallons (0.066 - 378 L)
Inlet Ports: Threaded: FNPT, BSP
Flanged: ANSI, DIN, Socket
Materials: Aluminum
Carbon Steel, 316L Stainless Steel
Alloy 20, Hastelloy C
Epoxy, PVDF and PTFE Coated Steel
  Specifications – Sentry High Pressure
Maximum Pressure: 13,500 psi (930.8 bar)
Temperature Range: -60°F to +225°F (-51°C to +107°C)
Capacities: 8 to 24 cubic inches (0.13 - 0.39 L)
Inlet Ports: Threaded: FNPT
Flanged: ANSI
Materials: Carbon Steel, 316L Stainless Steel
Alloy 20, Hastelloy C
More Information ...
  Specifications – Sentry Sanitary
Maximum Pressure: 1,000 psi (68.9 bar)
Temperature Range: -20°F to +350°F (-28°C to +176°C)
Capacities: 4 cubic inches to 10 gallons (0.066 - 37 L)
Inlet Ports: Tri-clamp Sanitary Fitting
Shell Materials: 30 RA Polished 316L Stainless Steel
Bead Blasted 316L Stainless Steel
  Specifications – Sentry PTFE
Maximum Pressure: 100 psi (6.9 bar)
Temperature Range: +40°F to +220°F (+4°C to +104°C)
Capacities: 4 to 370 cubic inches (0.066 - 6 L)
Inlet Ports: Threaded: FNPT, BSP
Flanged: ANSI, DIN, Metric Flare Type
Shell Materials: Machined PTFE
  Specifications – Sentry Tef-Guard HP II (Unique PTFE Diaphragm Design)
Maximum Pressure: 2,000 psi (137.9 bar)
Temperature Range: +40°F to +220°F (+4°C to +104°C)
Capacity: 14 cubic inches (0.23 L)
Inlet Ports: Threaded: FNPT
Flanged: ANSI
Shell Materials: Carbon Steel, 316L Stainless Steel
Alloy 20, Hastelloy C
  * Maximum PSI rated for ambient temperatures.
** Reflects entire temperature range for all available materials. Consult us on specific materials.

  Bladder Options
Elastomer Temperature Limits Applications
Neoprene +0°F to +200°F
(-18°C to +93°C)
Good abrasion resistance and flex
Use with moderate chemicals
Buna +10°F to +180°F
(-12°C to +82°C)
Good flex life
Use with petroleum, solvents, and oil-based fluids
EPDM -60°F to +280°F
(-51°C to +137°C)
Use in extreme cold
Good chemical resistance with ketones and caustics
Hypalon -20°F to +275°F
(-29°C to +135°C)
Excellent abrasion resistance
Good in aggressive acid applications
Viton -10°F to +350°F
(-23°C to +176°C)
Use in hot and aggressive fluids
Good with aromatics, solvents, acids and oils
Aflas +0°F to +400°F
(-18°C to +204°C)
High temperature, petroleum based chemicals
Strong acids and bases
FDA Silicone -20°F to +300°F
(-29°C to +149°C)
FDA-approved food grade material
For use in food and pharmaceutical processing
FDA Buna +10°F to +180°F
(-12°C to +82°C)
FDA-approved food grade material
Similar characteristics of regular Buna
Santoprene -20°F to +225°F
(-29°C to +107°C)
Excellent choice as a low-cost alternative to PTFE
PTFE +40°F to +220°F
(+4°C to +104°C)
Bellows design, excellent flex life
Use with highly aggressive fluids
  Air Control Options
The chargeable model has a Schrader type charging valve that allows for a predetermined pressure charge to be applied and held in the dampener. No permanent source of compressed gas is required to be attached to the unit. The chargeable models are used primarily with metering, piston and peristaltic pumps for pulsation dampening. Chargeable models are also used for surge suppression to prevent water hammer from quick closing valves, for make-up fluid to prevent pump cycling and for suppression of pump start up or shut down pressure spikes.
Inlet Stabilizer
The patented inlet stabilizer air control (U.S. Patent No. 6,089,837) consists of a compound pressure gauge, a pressure/vacuum tight ball valve and a venturi valve. When compressed air is passed through the venturi valve at high speed, a low pressure area is created which is used to evacuate the air from the stabilizer, creating a vacuum internally. Conversely, when the flow of air through the venturi valve is diverted into the stabilizer, a pressure charge is obtained. When pump inlet conditions are optimized, pump efficiency is maximized.
An automatic poppet type valve located in the non-wetted section of the dampener allows for an increase in compressed air pressure to balance an increase in system liquid pressure. As liquid system pressure increases, the bladder is pushed further up into the dampener until it contacts the internal automatic valve. This contact opens the valve and allows an increase of compressed air to enter the dampener. When the air pressure inside the dampener equals the system liquid pressure, the dampener is in balance and pulsations are minimized. If a change in pressure occurs this process is repeated. Automatic units are designed for use on air operated diaphragm pumps in systems with a varying discharge pressure.
The adjustable model uses a self-relieving regulator to set dampener pressure. A compressed air line must be permanently attached to the regulator. The regulator allows for an easy, convenient method for readjusting the dampener pressure if the system fluid pressure changes. Adjustable units are designed for use on air operated diaphragm pumps in systems with a constant discharge pressure.

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