The Penn Valley pump is a diaphragm pump. Penn Valley has acknowledged this in their patent # US 7,559,753 B2, where they reference application # GB 2013287A Diaphragm pump as the basis of construction. Also Penn Valley’s application with the trademark office also reference diaphragm pumps.
Pump Comparison Chart Sludge Pro vs. Penn Valley
Features
Wastecorp Sludge Pro®Pump Technology
Penn Valley Pump Co.
Technology
Positive displacement reciprocating diaphragm pump per ANSI/HI standards
Positive displacement reciprocating diaphragm pump per ANSI/HI standards
Principle of Operation
Positive displacement pump using reciprocating motion and check valves to displace liquid from suction to discharge side of pump
Positive displacement pump using reciprocating motion and check valves to displace liquid from suction to discharge side of pump
Solids Handling Capability
All 3”, 4" and 6" pumps pass up to 2½” solids
Suction and discharge flow path are of equal sizes
Passes only 1” solids (on equivalent 4" pump)
Disc
Manufactured of ductile iron that acts as the pumping element in conjunction with the check valves
Disc has Lifetime warranty
Discs never contact the pump body
Diaphragm manufactured of elastomeric components that act as the pumping element as well the check valves
Diaphragms are wear item and have limited warranty
Diaphragm directly compress on pump body and debris, which can prevent sealing and cause deformation
Check Valves
Polyurethane ball checks encased in rugged cast iron valve chamber.
Clack Valve available in Buna-N, Neoprene, or viton
Rubber check valve encased between two pump bodies. Very difficult and labor intensive to access
A third separate inlet check valve is also required to aid in priming
Trunnion
Sealing device that flexes with the mechanical reciprocating motion to seal liquid within pump body
Sealing device that flexes with the mechanical reciprocating motion to seal liquid within pump body
Pumping Action
Reciprocating pumping with extended stroke length operating at low speed. Stroke length and speeds are directly proportional in positive displacement pumps
Low operating speeds (below 110RPM) provide less load on drive components and extended life on trunnion and disc by millions of cycles.
All reciprocating pumps create pulsing flows and use pulsation dampeners to reduce pulsation
Short stroke length requires very high speeds to achieve same flow rate
Check valves and trunnion have to work up to 5 times faster at higher speeds to obtain same flow
Operating speeds up to 500RPM which can cause faster wear of components
All reciprocating pumps create pulsing flows and use pulsation dampeners to reduce pulsation
Power Drive Arrangement
Standard mechanical gear reducer direct drive coupled to pump main shaft
Superior torque ratings over belt and pulley systems
Pump shaft connected by flexible coupling assembly to drive arrangement
Coupling aids to handle any shock loads and prevent backlash and noise
Standard antiquated belt and pulley technology
Belts tend to slip at higher torque ratings
Pump shaft connected by taper bushing to drive arrangement
Pump/drive arrangement take brunt of any shock loads and backlash
Offers gear reducer direct drive as an option
Maintenance
Coupling provides easy access to drive pedestal assembly for replacement of trunnions and disc (one process)
No need to crawl under pump to maintain trunnions or discs
Easy access to check valves through quick-opening valve covers.
Check valves and suction trunnion only accessed from below pump
Drive pedestal must be removed from belt drive system to replace discharge trunnion
To replace the internal clack valve, the suction elbow must be disconnected from pump housing
Base Frame
Heavy-duty fabricated steel channel with supporting pedestal feet for direct mounting to floor (optional 304SS foot base)
304SS lightweight tube frame with pedestal feet
Installations
Wastecorp has been manufacturing reciprocating positive displacement pumps for over 24 years
References available for Sludge Pro pumps upon request.
Manufacturing Capability
ISO 9001 and ISO 14001 certified facility.
Made in North America
No ISO quality control certification
Warranty
Two (2) Years (Lifetime on Discs)
Two (2) Years (limited warranty on check valves)
Spare Parts
Large inventory of parts kept in stock for next day delivery
Spare Parts kept in inventory in select local Counties, Cities, States and Provinces
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About Wastecorp Pumps
Wastecorp is an ISO 9001 and ISO 14001 certified pump manufacturer with decades of positive displacement pump experience in the municipal and industrial sectors. Wastecorp’s North American based manufacturing facilities make a diverse range of high quality pumps primarily used for wastewater fluid transfer applications. The company specializes in sewage pump and wastewater pump manufacturing. This includes multiple products for municipal/industrial applications. Information about Sludge Pro Double Disc Pumps can be found here.
What is a Double Disc Pump?
Wastecorp, Penn Valley and others are categorized as a reciprocating positive displacement mechanical diaphragm pump as defined by the American National Standards Institute/Hydraulic Institute Standards, who is the recognized global authority of pump guidelines and standards.
Wastecorp uses this terminology to distinguish the large disc used in the Sludge Pro’s patented pump design. The disc is the main element that transfers the liquid in conjunction with the check valves. The trunnion is the flexible seal that ensures a leak free design. The robust design has an excellent track record of long term durability and trunnions are engineered to last millions of cycles.
Are Parts for Sludge Pro Double Disc Pumps Available Within 24 hours?
Yes. Wastecorp can send parts for your double disc pump for delivery within 24 hours in most areas of the United States and Canada. In select areas, Sludge Pro parts are stocked in the State/Province or county that the pumps are located in.