Core Technologies

GSPS Pump’s EVP self-priming system utilizes a specially designed 3rd generation vacuum pump technology. EVP system enables any centrifugal pump finish priming within seconds to tens of seconds. It has extraordinary features like large air process capability, high vacuum, low operation temperature, maintenance-free, oil and mechanical seal free, etc., which sets up a new benchmark in the self-priming pump market.

EVP system will be switched to sleep status automatically once priming is finished. When it is used for general purpose applications, the EVP system only operates for a few seconds for priming, which makes it almost unnecessary for daily maintenance or changing spare parts at its life cycle.

Instant-Prime® Pumps can run dry for a long time without damaging their mechanical seal due to the dry-running protection system, which consists of a normal mechanical seal, an oil chamber, and an oil reservoir. The oil chamber and oil reservoir are connected by two hoses and forms an oil circulating loop. As an option, the mechanical seal stationary seat can also be made with an air cushion designed surface, which eliminates the use of oil lubrication in case of pump’s long-time dry running. We can also use a set of lip seals to replace the mechanical seal as a second option 2, which makes the sealing result even better and subsequent maintenance easier.

A pressurized cooling flush water is introduced from the centrifugal pump’s water passage through an access port into the vacuum pump’s water jacket, which contains the entire vacuum pump. Cooling water flows into the water jacket from one side through a suction hose and discharges from the other side, then returns back to the centrifugal pump’s suction side through a discharge hose. Pressurized flushing water cools the vacuum pump quickly and brings most of the heat out of the vacuum pump’s cavity, keeping the vacuum pump running at a very low temperature and giving the EVP system an extraordinarily long life.

It is very convenient to remove the vacuum pump’s cover from its non-drive end, and slides can easily be pulled out for inspection or replacement. It is also easy to access the centrifugal pump’s impeller, wear ring, and mechanical seal for inspection or maintenance without removing the diesel engine or the pump’s frame since the centrifugal pump’s suction cover can be fully opened.

All the solids handling Instant-Prime® Pumps are designed with a wide water passage impeller, which allows solids with 3” diameter or larger to pass through the impeller easily. Instant-Prime® Pumps can be widely used in any critical application like sewage, sludge, and even processing fluid with large size stones.

Instant-Prime® Pump’s stuffing box is designed with a special structure to mix and discharge solids. Any small size solids or sands entering the stuffing box will be mixed by the mixers located on the wall of the stuffing box, and then discharged to the outside of the stuffing box with the centrifugal force generated by the impeller back vanes. This self-cleaning function efficiently prevents the mechanical seal spring from clogging by any solids or sands accumulated inside the stuffing box, thus avoiding any mechanical seal failures.

Instant-Prime® Pumps hold multiple patent-pending technologies. Because of the EVP Priming System’s powerful function, it can be used in almost all aspects of the fluid industry, such as dewatering, by-pass, fire-fighting, lift station back-up system, mining, irrigation, water transfer and well point systems, etc.