Zenith^® H Series Gear Pumps - Precise, Pulseless, Repeatable Performance in High Temperature Applications

[Description]  [Features]  [Specifications]  [Applications]  [HPB]  [HMB]  [HLB]  [HXB]  [Selection Guide]  [Pump Capacity Selection Chart]  [Shear Rate vs. Speed]  [Constant K]  [Maximum Torque]

Download brochure
Download Installation, Care, and Maintenance Manual
Fast delivery

In 1926, Zenith Pumps was approached by the synthetic fiber industry to design a pump to provide a precise, pulseless, repeatable flow and assure better quality control. The options then were the same as those in the chemical process industry today - diaphragm, lobe, coarse gear, piston, plunger, and screw pumps. Each had problems with pulsation, flow inaccuracies, multiple seal areas and slippage, which required constant calibration, high maintenance, and extended downtimes.

Zenith Pumps met the challenge and designed a rotary external gear pump of unique precision and simplicity. Manufacturing techniques were developed to hold tolerances to ±.00005" minimizing internal clearances to assure accurate and precise metering. The pump's simplistic design of only three moving parts - two metering gears and a drive shaft - provided long life and easy maintenance.

For years since, process engineers have relied on Zenith to provide precision fluid handling solutions for their most difficult pumping applications. Zenith gear pumps can found wherever precise, pulseless, repeatable metering of fluids is required.

Features 

• High Accuracy - Stable, repeatable flows are assured even under varying conditions of temperature, viscosity, and pressure.
• Minimum Pulsation - Unique design offers virtually pulseless flow without valves or flexible elements to hinder performance.
• High Temperature Capability - Operating temperatures to 950°F (510°C).
• Maximum Life - Only three moving parts; components are through-hardened tool and die steels to 62 R_c or better. Replaceable sleeve bearings for low-cost rebuilds.
• High Volumetric Efficiency - Maximum efficiency is achieved with optimum operating clearances and assured under pressure by built-in alignment dowels.
• Precision Construction - Ground and lapped components for close control of operating clearances.

• Pump Type: Rotary external spur gear, single stream.
• Rotation: Refer to pump drawing.
• Operating Speed: 3-180 rpm depending upon application conditions and fluid viscosity.
• Temperature: To 950°F (510°C)

Applications 

The H Series pumps are ideal for metering in such applications as:
Adhesives	Foams	Urethanes	Plasticizers	Monomers
Additives	Coatings	Surfactants	Polyols	Oils
Asphalt	Inks	Oxide Slurries	Plastics	Pigments
Abrasives	Fibers	Lubricants	Paints	Tars
Bottoms	Pitch	Polymers	Resins	Many others

	HPB Pump  Flow Rates: .00013 to 0.14 gpm (.00048-.526 l/min). Capacities: .16/.297/.584/1.168/1.752/2.92 cc/rev. Inlet Pressure: Flooded suction recommended; 40 psi (2.8 kb/cm2) required to energize mechanical face seal. Discharge Pressure: Limits 4,000 psi (281 kg/cm2). Viscosity: 1 to 2,000,000 cps. Porting: 3/8" inlet, 1/4" discharge. Mounting: L-16 Parco-Lubrite cast iron mounting saddle, 3/8" inlet, 1/4" discharge NPT female. Materials of Construction: M series tool steel. Seals: Grafoil Packing-Model 5704. Mechanical face with tang slot - Models 4647 and 5205. Mechanical face with outer drive shaft - Models 5556 and 5557.
	HMB Pump  Flow Rates: .00028 to .476 gpm (.011-1.8 l/min). Capacities: 3.5/5.5/10.0 cc/rev. Inlet Pressure: Flooded suction recommended; 40 psi (2.8 kb/cm2) required to energize mechanical face seal. Discharge Pressure: Limits 4,000 psi (281 kg/cm2). Viscosity: 1 to 2,000,000 cps. Porting: 1/2" inlet, 5/16" discharge. Mounting: L-5471 Parco-Lubrite cast iron mounting saddle, 3/8" inlet, 1/4" discharge NPT female. Materials of Construction: M2 tool steel - All standard models. Seals: Grafoil Packing-Model 5740. Mechanical face with tang slot - Model 4892. Mechanical face with outer drive shaft - Model 5555.
	HLB Pump  Flow Rates: .008 to 2.4 gpm (.03-9.0 l/min). Capacities: 10/20/30/50 cc/rev. Inlet Pressure: Flooded suction recommended; 40 psi (2.8 kb/cm2) required to energize mechanical face seal. Discharge Pressure: Limits 4,000 psi (281 kg/cm2). Viscosity: 1 to 2,000,000 cps. Porting: 1" inlet, 3/4" discharge. Mounting: L-5139 Parco-Lubrite cast iron mounting saddle, 1" inlet, 3/4" discharge NPT female. Materials of Construction: M series tool steel. Seals: Grafoil Packing-Model 5592. Mechanical face with outer drive shaft - Model 5548.
	HXB Pump  Flow Rates: .055 to 9.5 gpm (.21-36 l/min). Capacities: 70/100/147.5/200 cc/rev. Inlet Pressure: Flooded suction recommended. Discharge Pressure: Limits 4,000 psi (281 kg/cm2). Viscosity: 1 to 2,000,000 cps. Porting: 2" inlet, 1-1/2" discharge. Mounting: L-5427 Parco-Lubrite cast iron mounting saddle, 2" inlet, 1-1/2" discharge NPT female. Materials of Construction: M series tool steel. Seals: Grafoil Packing-Model 4980.

The following are general guidelines for pump selection and should be confirmed  with the factory or sales representative before ordering.

1. Choose appropriate pump capacity based on flow rate. (See Chart 1).
2. Determine pump operating speed (N).  N = Flow Rate (cc/min) ÷ (C) Pump Capacity (cc/rev)
3. Determine operating viscosity (V) in poise. If fluid is non-newtonian, follow steps 3a and 3b.
   1. Identify pump’s operating shear rate. (See Chart 2)
   2. Refer to your viscosity vs. shear rate curve for operating viscosity (V) in poise.
4. Refer to Table 1 for pump constant (K).
5. Determine differential pressure (P) (discharge - inlet) in psi.
6. Calculate input torque using the following:

   T_h = .01• P • C
   T_v = N • K • V
   T_t = T_h + T_v

7. Determine maximum torques from Table 2.
8. Choose a speed reduction ratio (R) based on pump operating speed.

   R = 22:1; 4 - 82 rpm
   R = 11:1; 8 - 160 rpm
   R = 5:1; 18 -180 rpm

9. Drive Horsepower = T_t / (35 • R • .87)
10. For hp <.5, choose .5 hp.  For hp between .5 and 1.0, choose 1 hp.  For larger hp, round up to the nearest whole number.

Shear Rate vs. Speed