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PZ series include PZ-8, PZ-9, PZ-10 and PZ-11. This series of drilling mud pump is a horizontal triplex single acting piston pump which is made by Qingzhou Petroleum Machinery Factory Co., Ltd. utilizing American technology and API standards. All wearing parts can interchange with each other among parts of the same PZ series mud pump.

PZ 8's specifications:
Model: PZ-8
Type: Horizontal triplex single acting piston pump
Maximum Input: 750 HP (560kw)
Stroke Length: 8" (203 mm)
Maximum RPM: 145 RPM
Gear Ratio : 4.5:1
Jack Shaft Speed: 652 RPM
Piston Load: 76,800 lbs. (34,836 kg)
Weights: 41,850 lbs. (19,000 kg)

PZ 9's specifications:
Model: PZ-9
Type: Horizontal triplex single acting piston pump
Maximum Input: 1000 HP (746kw)
Stroke Length: 9" (229 mm)
Maximum RPM: 130 RPM
Gear Ratio : 4.48:1
Jack Shaft Speed: 582 RPM
Piston Load: 101,550 lbs. (36,062 kg)
Weights: 44,052 lbs. (20,000 kg)

Their main design feartures are as follows:
1. Pump shell is welded assembly of castings steel and steel plates;
2. Crankshaft bearings are double-row spherical roller bearings;
3. Double extended jackshaft carried on heavy-duty straight roller bearings;
4. Connecting rod top is fitted with roller bearing;
5. Wrist pin end carried on double-row long cylindrical roller bearing;
6. Replaceable bronze crosshead slides;
7. Main gears are machined to herringbone gears;
8. Lubrication system is the combination of forced lubrication and splash lubrication;
9. The values are API 7# values seat;
10. Discharge connections can be made on either side of the pump;
11. Suction connections are at the center of the cylinder manifold.

Standard equipment:
1. Heat-treated alloy steel, interchangeable fluid cylinders.
2. Threaded valve covers.
3. Plated piston rods.
4. Complete piston washing and lubrication system
5. Discharge pulsation dampener.
6. Individual suction and discharge manifolds.

Optional Equipment:
1. Large steel skid with non-skid decking.
2. Centrifugal suction charging pump.
3. Rubber valve inserts.
4. External electric powered lube pump.
5. Top electric motor mounts.
6. Belt-driven centrifugal suction charging pump.
7. Electric-driven centrifugal charging pump.