For decades, piston pumps have been used to meet a vari […]
For decades, piston pumps have been used to meet a variety of handling, extrusion, coating and dispensing requirements in many industrial and commercial applications. The versatility of the piston pump makes it the main force in all aspects from pressure cleaning, sand blasting, bonding, chemical dosing, potting, painting, lubrication and road marking to sanitary distribution. In view of this versatility, it is necessary to consider the type and viscosity of the fluid being transported and the associated flow rate and output pressure of these materials to ensure that the correct pump is selected for the application.
Piston pumps are classified as reciprocating positive displacement pumps that utilize a piston or plunger to draw and move fluid through a sealed cylinder.
The fluid inlet of the piston pump is typically immersed directly into the fluid, and then when the plunger reciprocates, the fluid is drawn into the pump via a negative pressure. The combination of check valve timing and plunger motion allows fluid to be dispensed in the up and down strokes at output pressures up to 15,000 (psi) per square inch and flow rates up to 60 gallons per minute (gpm).
As the viscosity of the fluid is added and the fluid is drawn into the pump more difficult, the driven plate can be connected as part of the piston pump assembly and pneumatically or gravity driven fluid into the pump.
Piston pumps are driven by a variety of motors, including pneumatic, hydraulic and electric.
Air motors are the most common choice due to their reliability, ease of protection, outstanding power density, no stalling motor damage and the inherent safety of volatile gases.
Hydraulic pumps provide better power density and quieter operation than pneumatics. Hydraulic piston pumps tend to prioritize the mobile application of a vehicle's power take-off (PTO), or when the motor is icy and may cause cold conditions. The piston pump driven by the electric motor is energy efficient, but due to the low power density, the electric pump cannot supply the pressure required for many industrial applications, constraining the use of fluids of lower viscosity and the main touch handling or spraying applications.
Use pump type
Multiple pump ends are available for piston pumps to successfully handle a wide range of fluid characteristics. These are called the lower end, they have two types of balls, four balls and chopping view types. Double and four ball piston pumps are planned for low to medium viscosity fluids and are typically used for handling, cleaning and coating applications. For extrusion applications with high viscosity data up to 1 million centipoise (CPS) or more, heavy duty chopper viewing and double ball pump packaging are available.
Severe kneading tasks typically require additional accessories, such as pneumatic head assemblies and follower plates, to provide additional force to move fluid into the pump, and thermal blankets to reduce data viscosity or fluid regulators to ensure accurate dispensing. Control.
Although there is a measure of ability crossover, each type of piston pump has constraints. Consult a manufacturer or distributor when selecting a pump or selecting a pump for a particular application.
Handling viscous conditions
When using piston pumps to transport aggressive media with shear-sensitive ultraviolet (UV) inks or adhesives with suspended solids, special tube and plunger coatings and fill seals are used. These minimize shear and heat and are resistant to any wear that may occur. Stainless steel pumps, combined with ceramic-coated cylinders and piston rods, provide water-based and wear-resistant properties that improve durability and reduce wear when used with harsh materials. All of these functions combine to help prevent premature pump failure.
Understanding the ultimate goal of fluids and applications is critical to adhering to product integrity. Some fluids require shear handling or thermal assistance to bring them to a viscosity that can be handled simply while minimizing the risk of irreversible fluid damage.
Shear sensitive materials range from emulsions, pancakes to pastes, cornstarch, inks, certain adhesives and certain coatings to all products.
This data requires low internal speed and gentle pumping to constrain damage and maintain its utility during handling. In the microelectronics industry, many sealing compounds contain added fillers for improved utility.
This results in a mixture of solid and viscous properties, which may be useful for useful applications without damaging the pump or data.
With so many variables, the software package is pre-configured with the right motors, piston pumps, mounts, controls and accessories to give the operator maximum flexibility. With regard to end users, pre-assembled and validated application packages eliminate the large amount of guesswork that comes with choosing the right pump for the job.
Adhesives, such as multi-component or glass-filled sealants, require stainless steel or carbon steel piston packaging options, coated tubes and plunger rods to handle applications that are difficult to squeeze and handle. For new or common uses, consult the pump manufacturer's viscosity and chemical compatibility resources, or consult an expert to properly package the package.
What is internal counting
The planning and engineering methods of the piston pump will affect its function and function when it is used.
With a simple motor planning, universal valve block and pump connection, the piston pump operator can easily move between motor dimensions, create new pump ratios, and upgrade the system without having to purchase a new pump. Other functions include:
Progressive exhaust motor planning to minimize icing
Adjustable packing seal and optional component coating for improved pump life
Quickly disassemble for easy protection
Thermal release kit to avoid overpressure
All of these features make the piston pump a versatile selection for a wide range of applications for precise fluid movement.
Protection and expansion of piston pumps
Since it has few moving parts, the protection piston pump is relatively simple. When monitoring and manipulating cleanliness, circulation rates and other wear factors, the piston pump can continue for months or even years between protection cycles. In order to extend the service life of the pump and system components, it is necessary to protect the piston pump from contamination.
Proper pump cleaning should be consistent with the frequency of application and the fluid being pumped. This is particularly important with corrosive chemicals, in which case it is advisable to flush the pump with a neutralizing solution and then rinse with water after each application.
While coated plunger rods and tubing, as well as PTFE or ultra high molecular weight polyethylene (UHMW-PE) packing options, can extend the life of the pump, the planning of the packing seal can be worn and still requires routine monitoring and replacement.
Flow, application requirements, and fluid type all help predict the frequency of periodic protection replacements, but indicators such as fluids in solvent cups, pressure loss, or uneven pump cycles can also be used as service symbols.
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Thanks to the flexibility of its various materials in a variety of industrial applications, piston pumps continue to demonstrate their importance as key components in useful fluid handling systems.