Piston Pump
Iraida
A piston pump is a type of positive displacement pump where the high-pressure seal reciprocates with the piston.[1] Piston pumps can be used to move liquids or compress gases. They can operate over a wide range of pressures. High pressure operation can be achieved without adversely affecting flow rate. Piston pumps can also deal with viscous media and media containing solid particles.[2] This pump type functions through a piston cup, oscillation mechanism where down-strokes cause pressure differentials, filling of pump chambers, where up-stroke forces the pump fluid out for use. Piston pumps are often used in scenarios requiring high, consistent pressure and in water irrigation or delivery systems.[3]
In a lift pump, the upstroke of the piston draws water, through a valve, into the lower part of the cylinder. On the downstroke, water passes through valves set in the piston into the upper part of the cylinder. On the next upstroke, water is discharged from the upper part of the cylinder via a spout. This type of pump is limited by the height of water that can be supported by air pressure against a vacuum.
Piston pumps may be classified as either single-acting and single-effect (the fluid is pumped by a single face of the piston, and the active stroke is in only one direction) or double-acting and double-effect (the fluid is pumped by both faces of the piston, and the strokes in both directions are active).
In a single acting pump, only one side of the piston is in contact with the fluid. As a result of this, only one stroke is a delivery stroke. The theoretical delivery rate can be calculated by using the following equation:[5]
In a double acting pump, both sides of the piston are in contact with the fluid. As a result of this, both strokes are delivery strokes. An approximation of the delivery rate is given by the following equation:[5]
The piston in a plunger and piston pump does not move at a constant velocity and as a result of this the pressure and delivery fluctuate over the duration of the stroke. The following diagram shows the relation between the angle of the crankshaft and the delivery rate of a single-acting and double-acting pump. The line shows the average delivery rate of the pump. These fluctuations in pressure and delivery can cause undesired effects such as water hammer and thus are generally mitigated by the installation of an air-filled accumulator. The delivery can be further smoothed out by the use of multiple cylinders that are offset from one another.
Cat Pumps high-pressure piston pumps are recognized in the industry as the longest-lasting, most reliable pumps available. Cat Pumps designs and builds products to the highest quality level because our customers depend on our products to keep their equipment running.
Piston pump performance range is 3.0 GPM to 60 GPM (11.3 to 227 LPM) and 100 PSI to 1,500 PSI (6.9 to 103 BAR). Piston pumps exhibit excellent suction capability, often not requiring flooded suction or booster pumps. Pumps are available with brass and 316 stainless steel manifolds and 304 stainless valve components. Cat Pumps has built a worldwide distribution network for pumps, parts, and accessories when servicing is required. Our superior design, including proprietary seal and valve kits, makes maintenance easy. You can count on Cat Pumps to keep you running with the best service and fastest delivery in the business.
This triplex (three piston rods) positive displacement, reciprocating piston pump is constructed with chrome-plated brass manifolds, 304 stainless steel valve assemblies, and chrome-plated 304 stainless steel sleeves and cylinders. Pumps come standard with NBR (Buna-N) piston cups, seals and O-rings.
ARO piston pumps are capable of handling a range of viscous fluids. With a wide selection of pressure ratios and displacement rates available, ARO offers a number of piston pump packages that can meet your specific application and flow rates needs.
Offered in multiple configurations, including single-post, two-post and heavy-duty two-post, our customizable packages ensure you have the right solution for a variety of piston pump applications, including oil and grease, paint and spray coatings, adhesives, sealants, bulk material transfer and circulation and much more.
Our single-post, two-post, and cart-mounted systems are used to pump material out of containers. They enable quick container changeover, minimizing process interruptions. The 3.25" cylinders deliver best-in-class down force, improving material supply to the pump.
Connected to the pump and the ram, follower plates feed material into the pump from a variety of container sizes. In addition to improving pump performance, follower plates protect your material and reduce waste.
PIUSI P3.5:1 is a pneumatic piston pump for transferring oil. Designed and developed for use in particular application fields, it has been created with the use of the most suitable materials to guarantee high performance and durability.
The PIUSI P3.5 oil transfer piston pump is particularly suitable for the dispensing of medium viscosity oil for short and medium distances. It can be installed on drums and connected to a dispensing solution consisting of several service stations, equipped with reels and dispensing nozzles. It is therefore used in all workshops that need a high-performance oil transfer system that is durable and reliable over time.
The PIUSI P3.5:1 oil transfer pump is characterized by a solid protective and soundproofing structure. PIUSI P3.5:1 is equipped with a pneumatic exchanger and a three-stage air discharge system which, combined with the absence of colliding mechanical parts subject to breakage, guarantee low noise during operation (only 77 DB).
Available in different lengths, the PIUSI P3.5 oil transfer pump can be extended with optional extensions, and is equipped with a threaded ring nut that guarantees safe installation to the drum or wall support.
On our piston pump units we often use the above JD-9 Green Guard nozzle. We like it because it is easy to hold, especially while driving in a UTV. This nozzle is expensive at over $200. I first unscrew and remove a 3/4 to 1/2 inch reducer fitting that comes on the gun. I am touching that reducer. With the reducer removed the half inch hose fitting thread direct to the nozzle.
If you have one of these look at how it is attached to the hose. Here I am touching a swivel built into that hose fitting. When you buy hose ask for swivel fittings at both ends of the hose. They help with reeling up hose. At the nozzle end of the hose the swivel helps reduce how much you struggle with the hose.
The Hypro D30 piston pumps we use produce a little under 3-4 gallons per minute at high pressures of 150-350 psi. We use the extra large tip on the right. You have to ask for this tip when purchasing the nozzle.
The half inch hose and JD-9 nozzle are for piston pumps, or sometimes they are called piston/diaphragm pumps. These pumps produce low flow but high pressure. They are unique in that they only produce one flow rate no matter how big or long the hose is. With the Hypro D30 piston pump model a 300 foot hose produces 3-4 gpm of flow, the same as a 50 foot hose. The pressure at the nozzle is also the same on both hose lengths. The benefit of these pumps is you can use long light weight half-inch heat resistant hose which are great for un-reeling hose to get water where you want it.
The centrifugal pump is the standard in wildfire operations. A high flow is no problem if you are on a creek pumping water that does not run out. Or perhaps you are pumping from a very large fire truck tank where you can can pump 10 to 50 gallons per minute at modest pressure for a long time. On a UTV you will run out of water quick.
How to freeze protect a piston pump: Drain tank, spray empty, add maybe a gallon of pink antifreeze and pump the pink through the nozzle into the tank. If the night is not too far below freezing you can dilute the pink a bit. Some reuse the pink by spraying it into a jug. The pink stuff freezes at times but does not expand and break parts. An unheated shed can offer some freeze protection. The freezing overnight will occur in the hose reel, fittings, then the pump and last the tank.
Great information. Thank you! I am currently using D252 pumps which replaced the D9 on my 50 gallon sprayers. My mantra with the wet areas has been light, light and lighter equipment platforms. My M274A5 Mules are 800 lbs but can carry a 1000 pound payload. That is pretty good. The Weasels big advantage is 1.8 psi ground pressure or a quarter of a footprint. Not much can do better than that so it sits on top of the mud and does not rut anything up. 50 gallon Lesco sprayers work well on these platforms and keep weight to a minimum.
Reliable WOB-L Piston pump is perfect for many common laboratory vacuum applications. Features: Vacuum to 5 Torr (29.8"Hg). Includes Vacuum Regulator and Gauge - simple to adjust and monitor vacuum level. Muffler quiets pump and filters discharge air. For use with dry or aqueous vapor applications only.
Uniflow Piston Pumps = Legendary patented technology. Our unique yet simple uniflow design ensures fluid flows one direction throughout the pump. This reduces pulsation maintaining constant pressure for exceptional spraying efficiency. We offer a wide selection of mounting and plumbing versatility and attachments.
The Justrite safety can pump with 5 gallon plastic safety can offers an all-in-one storage and dispensing solution for flammable or combustible liquids. The Type I, FM-approved polyethylene safety can is fitted with a stainless steel pump that dispensing at the point of use. The wide filling spout makes it easy to receive liquids from bulk containers and includes a self-closing cap to provide pressure relief in the event of a fire.
The attached, manually operated piston safety pump delivers up to 3.5 oz. per stroke. It features a vacuum-relief valve that allows liquids to flow smoothly in a controlled and safe manner. The pump can be used with up to 90 weight oil viscosity at 70F. The pump can be used with up to 90 weight oil viscosity 70F. Its body is constructed of stainless steel with PTFE seals, offering superior chemical resistance and a long life.
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