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Positive Displacement (PD) pumps create pulsation and hydraulic shock due to the reciprocating nature of their stroking action, potentially damaging the entire pumping system.
Blacoh's SENTRY® Pulsation Dampeners and Surge Suppressors remove virtually all hydraulic shock, enhancing all-around performance and reliability of fluid flow in industrial and chemical transfer applications.
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PRINCIPLES OF OPERATION:
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%.
SENTRY BENEFITS:
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Whether a piston, plunger, air diaphragm, peristaltic, gear, or diaphragm metering pump, a SENTRY Pulsation Dampener placed at the pump's discharge will produce a near steady fluid flow up to 99% pulsation and vibration free. |
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Protects pipes, valves, fittings, meters, and in-line instrumentation from destructive pulsations, surges, cavitation, thermal expansion, and water hammer. |
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Creates steady and continuous flow when dosing, blending or proportioning additives. |
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Ensures accuracy, longevity, and repeatability of in-line meters. |
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Enables uniform application of material in spraying and coating systems. |
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Reduces agitation, foaming, splashing and degradation of product. |
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Provides liquid energy storage for emergency valve closure and other equipment shutdown. |
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Reduces overall energy cost with continuous flow, rather than start/stop flow. |
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Operates as a reservoir for make-up fluid. |
| SENTRY FEATURES: |
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Sizes available for all positive displacement pumps with discharge sizes from 1/8" (3.18mm) to 6" (152.4mm). |
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Simple, reliable design and quick installation. |
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Easy in-line maintenance. |
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Pressure ranges up to 4000 PSI (276 BAR) available from stock. |
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Temperature ranges from -60°F to +400°F (-51°C to +205°C) available from stock. |
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Custom models available up to 100 gallons (378.5L) and 25,000 PSI (1724 BAR). |
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Bodies available in a full range of chemically resistant materials. |
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Bladders available for even the most corrosive applications.
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| Specifications – Sentry Plastic |
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Pressure Rating*: |
Up to 150 PSI (10 BAR) |
| Temperature Range**: |
-20°F to +250°F (-29°C to +121°C) |
| Capacities: |
4 cubic inches to 5 gallons (0.066 - 18.0 L) |
| Inlet Ports: |
Threaded: FNPT and BSP
Flanged: ANSI and DIN |
| Shell Materials: |
Polypropylene
Conductive Polypropylene
PVC and CPVC
PVDF
Conductive Acetal |
| Specifications – Sentry Metal |
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Pressure Rating*: |
Up to 4000 PSI (276 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 and BSP
Flanged: ANSI and DIN |
| Shell Materials: |
Aluminum
Carbon Steel
316L Stainless Steel
Alloy 20
Hastelloy C
Epoxy, PVDF and PTFE coated steel |
| Specifications – Sentry Sanitary |
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Pressure Rating*: |
Up to 1000 PSI (69 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 |
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Pressure Rating*: |
Up to 100 PSI (6 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 and BSP
Flanged: ANSI and DIN
Metric Flare Type |
| Shell Materials: |
Machined PTFE |
| Specifications – Sentry XP High Pressure |
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Pressure Rating*: |
Up to 4000 PSI (276 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 |
| Shell Materials: |
316L Stainless Steel |
| More Information |
| Specifications – Armor-Damp High Pressure |
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Pressure Rating*: |
Up to 2000 PSI (137 BAR) |
| Temperature Range**: |
-60°F to +225°F (-51°C to +107°C) |
| Capacities: |
10 to 1,000 cubic inches (0.16 - 16.4 L) |
| Inlet Ports: |
Threaded: FNPT |
| Shell Materials: |
316L Stainless Steel
Alloy 20
Hastelloy C |
| More Information |
| Specifications – Sentry Tef-Guard HP II |
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Pressure Rating*: |
Up to 2000 PSI (137 BAR) |
| Temperature Range**: |
+40°F to +220°F (+4°C to +104°C) |
| Capacities: |
12 cubic inches (0.20 L) |
| Inlet Ports: |
Threaded: FNPT
Flanged: ANSI |
| Shell Materials: |
316L Stainless Steel
Carbon 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 |
| Compound |
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 agressive acid applications. |
| Viton |
-10°F to +350°F
(-23°C to +176°C) |
Use in hot and agressive 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 Buna. |
| FDA Fluorel |
-10°F to +350°F
(-23°C to +176°C) |
FDA-approved food grade material;
Fluorel is a fluorelastomer comparable to Viton. |
| PTFE |
+40°F to +220°F
(+4°C to +104°C) |
Bellows design, excellent flex life;
use with highly agressive fluids. |
| Air Control Options |
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Chargeable
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. |
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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. |
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Automatic
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. |
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Adjustable
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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Hours of Operation:
Monday – Friday, 8:30 a.m. – 5 p.m.
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