Also called a “pre-pressurizer”, the Shurflo pressure accumulator has the power to optimize the hydraulic system of the trailer or home engine without the need for an ultra-modern pump or full of increments. The Pressure Accumulator regulates the pressure, controls the “pulsating” effect of the pump, and also serves as a kind of “damping” of the system. In view of its importance, the staff at BLU-HOME, the RV parts, and equipment store made a point of sending us two copies for Review.
FUNCTIONING: A hydraulic system for a recreational vehicle, in addition to the direct water inlets, is summarized in a small set of segments of pipes or hoses that are found after the water pump to the taps and showers. The water coming out of the box is pressurized by the pump which, with the taps closed, exerts a maximum pressure (particularly for each model) until its automatic valve turns it off. At this time, the entire pipeline is exposed to that pressure to a limited extent.
SYSTEM PRESSURE: With each pump “on” and “off”, the great pressure variation ends up remaining even for the pipes or hoses that are generally flexible and with several connectors and splices that can suffer from this oscillation. In addition, pumps that do not have a “by-pass” system or even count, but with low capacity, can present the famous “pulse”.
PULSATION EFFECT: When we close the tap a little, the flow of the pump being greater than the flow of the tap, causes the piping to fill and pressurize first by locking the pump. While the tap remains open with little flow, the pressure drops in a few moments, causing the pump automatic to restart again, restarting the endless cycle. This “on-off” followed can cause problems or even burn the pump, in addition to compromising the piping mainly in the connections.
BANG EFFECT: In addition to the above events, whenever the pump locks and the tap opens, it will be subjected to the plumbing system, “dry” pressure blows or relief from them and will certainly be felt in the use of taps and showers.
ACCUMULATOR SOLUTIONS: It is on the above effects that the pressure accumulator acts by making it softer or canceling some of them. The device takes on the role of pressure in the system. Prepared for this function is where the pressure peaks will be concentrated. In addition, the pulsation effect will be reduced substantially by increasing the intervals and, in cases of greater flow, canceling such effect. For surges and blows in the system, the accumulator tank will play a role in smoothing these forces, resulting in a smoother system operation.
BENEFITS FOR THE PUMP: For the water pump, it means longer service life, especially in the “automatic” system, which usually causes problems first. The item “consumption” is also benefited. With fewer cycles and peaks in the engine, the pump’s energy consumption will be lower and even the pump’s noise will be lower, meaning more comfort for the occupant. Saving water is also a reality, because with less flow without discomfort, less water will be used.
It is not just a chamber: Many people think that the Shurflo accumulator is just a simple air chamber made of plastic with a different design, prescribing the option of “manufacturing” homemade accumulators using PVC tubes with lids and flanges. They are mistaken. The shurflo accumulators have an internal air bag that can be “inflated” so that the necessary and desired pressure for the closed hydraulic system of the trailer can be regulated. For this reason, the device body also has a much higher pressure resistance capacity than the normal water inlet. In homemade accumulators, levels of improvement of the pump pulsation are achieved, but are regulated by the actual pressure of the water pump.
FEATURES: The equipment is quite simple. Lightweight, it is all made of injected plastic with the 1/2 inch thread connections incorporated. Both the chamber screws and the pressure nozzle are made of stainless steel. It has a hole for fixing in the RV and comes with two protective covers at the outlets.
THE REVIEW: We apply the accumulators to our trailer, which has two separate pumps, one for cold water and the other for hot water. Although they have a bypass system that can dispense with the device for the “pulse” item, it can help with the service in addition to solving other issues. In our case, eliminating the effects of “blows” in the system, in addition to regulating the system when using the “direct water” system. In this case, the camping tap water supplies the trailer without the need for a pump and the accumulators regulate the external pressure in order to equalize it. In normal use of pumps, even with the bypass , the accumulators help to improve the anti-pulsation effects even more.
UNBOXING: The accumulators arrived at our headquarters packed in an illustrated box and very well protected in bubble wrap. The pressure air nozzle comes with a metal cap and the 1/2 inch male threaded connections have a blue plastic cap.
INSTALLATION: The accumulator, despite having two connections (input and output), can be installed in different and free ways, even if using only one of the connections. Always after the pump, it must also be placed before the action of filters or check valves. The positioning of the device is also free, however the factory recommends leaving the pressure loading valve facing upwards. “ Threaded fittings (plastic / nylon only) should be tightened about 1/2 to 1 turn after tightening by hand. Never exceed 6 ft / lbs [88 Nm] of torque on turns.”To make these instructions feasible without the use of technical tools, it pays to use the plastic“ butterfly ”type connections (optional) and tighten them only with the strength that your hands are capable of. In case of leaks, tighten further with the aid of a tool.
PRE-LOAD:The accumulator charge must be carried out with hand pumps. avoiding gas station pumps that can exert pressure above the limit to re-read from there. Bicycle or even electric pumps to inflate a car tire will give pressure slowly. If the pump does not have a pressure gauge, specific external gauges can be used. The correct pressure for the accumulator preload is the same as the reclosure rating of the pressure pump automatic. One example, 45PSI pumps, switch off at this pressure and restart the automatic from 30PSI on the system. It is exactly these 30PSI that should be the pressure in the preload of the device. There are still more technical applications for regulating the preload and composition of systems with readings and suppression of water hammer, but these only with professional devices and tools.
USE / REVIEW:Our test took place with two different scenarios. The first was the application of the accumulator in the old system of our trailer that was served by a single old water pump of 1.1GPM Shurflo that fed both the hot and cold water systems. The second scenario was in the testing environment of 2 Sea-Flo pumps that were the result of a review at MaCamp. In that case, despite being installed in the trailer system, they were not permanently placed and both tested in the same unique hot water system as our trailer. The difference between the two scenarios is that the old 1.1GPM pump does not have any by-pass system, although it already has an automatic (essential function in the pump for the application of an accumulator device). SEA-Flo pumps, in addition to the automatic system, with promised by-pass systems that are nothing more than internal shortcuts that seek exactly to reduce the pump’s pulsating effect. SEA-Flo pumps are different (one with 3 and the other with 5 diaphragms).
SCENE 1:With the Pump in a somewhat “original” form of the trailer, an old 1.1 GPM Shurflo made the connection of the accumulator as simple as possible (one inlet) through a hose that meets the closed water system. Her normal situation without the device is a flow well suited to the trailer, but with the need to always use the tap all open. Any dosage in the handle already starts to pulse quickly. When the tap is turned on, the pump immediately turns on with normal water flow and when it closes, it immediately turns off by locking the water. With the presence of the accumulator and it is properly loaded with internal pressure in the preload, things change. When opening the tap, the pressure coming out of the water is very high, decreasing to the normal flow after a few seconds. When we close the tap, the pump continues to run for a few seconds and “locks” very smoothly where its noise clearly demonstrates that the rotation is decreasing due to the increase in pressure. The pulse rate decreases extremely when we open the tap in a minimum flow of water, turning off and on at much more sparse intervals, and there is not much difference in flow when turned on or off. When the flow of the faucet is higher (but at an intensity that without the accumulator already made the pump pulse), the pump does not even turn off and, consequently, pulsates. being that there is not much difference in flow when turned on or off. When the flow of the faucet is higher (but at an intensity that without the accumulator already made the pump pulse), the pump does not even turn off and, consequently, pulsates. being that there is not much difference in flow when turned on or off. When the flow of the faucet is higher (but at an intensity that without the accumulator already made the pump pulse), the pump does not even turn off and, consequently, pulsates.
SCENARIO 2: In the review we carried out of the SEA-Flo pumps, we also inserted the presence of the accumulator, but in this case without testing the different preloads. We use the preload that comes from the factory that already matches the nominal characteristics of the red pump.
CONCLUSION: In the first scenario where the pump does not have a “bypass” the accumulator proved to be 100% effective and enormously necessary, since it allows the use of less water through the terminals, in addition to preserving the hydraulic set of the trailer. In the second scenario, the internal “bypass” system proved to be dispensable in the “pulsation” category. However, the trailer piping still has this damping system that can come from both the pump and the direct water system, leaving the application of the accumulator to the customer’s preference. In our case, even applying pumps with a “ bypass ”, we still insisted on preserving the use and application of the accumulators in both lines (hot and cold).
CHARACTERISTICS: Maximum Pressure: 125 PSI (8.6 BAR); Volume: 0.620L; Length: 22cm; Diameter: 9.5cm; External material: nylon; Inner bladder material: Butyl; Connection: 1/2 ″ male thread X2.
PRICE: At the time of this review the product was sold for R $ 349.00 at BLUHOME + Shipping.
WHERE TO BUY: At BLUHOME itself , via phone or whatsapp (47) 9.9182-0033 , e-mail ( firstname.lastname@example.org ) or at the PHYSICAL SHOP , Rua das Missões, 1445 – Ponta Aguda – Blumenau – Santa Catarina.
REVIEW – PRODUCT: This equipment was sent by BLUHOME who relied on MaCamp’s know-how to test its products in the Reviews section. Tests were done in our KG-330 trailer in the State of Rio de Janeiro and on trips through the States of SP, SC, PR, RS and RJ.