Continuous tooth herringbone gear. One-piece alloy steel crank. Renewable crosshead guide.

Features
1?Power end features
Continuous tooth herringbone gear. One-piece alloy steel crank. Renewable crosshead guide. The frame is made of welded steel plate to provide the frame with high strength, good rigidity and lightweight. The extension rod packing is of duplex seal structure to provide the good seal result. The power end uses the combined lubrication system of forced lubrication and splash lubrication.
2?Crankshaft
The crankshaft is made of cast alloy steel and is furnished with big geared ring, connecting rod and bearing. The tooth form of the big-geared ring is herringbone gear. The gear bore and the crankshaft surface is interference fitted and they are both fastened with bolts and lock nuts. The big end of the connecting rod is mounted on three eccentric straps of the crankshaft through single row short cylindrical roller bearings and the small end on the crosshead pin through double row long cylindrical roller bearing. Double row radial spherical roller bearings are mounted at both ends of the crankshaft.
3?Cylinders
Cylinders are made of forged alloy steel. Three cylinders of each pump are interchangeable. Valve-over-valve (through type cylinder) design reduces the cylinder volume and promotes the volumetric efficiency. At customers’ request, the cylinder surface may be nickel plated to improve the abrasion resistance.
Parameters

Model	Type	Rated Stroke	Rated Power	Gear type	Gear Ratio	Suction Pipe Diameter
NF-500	Triplex piston single role	165r/min	373KW	Herringbone gear	4.285 :1	203mm
Discharge Pipe Diameter	Small diameter gear	Bond	Valve	Weight	Lubrication
101.5mm5000psi	139.6mm	31.74×31.74mm	Valve valve on theAPI#5	9771Kg	Mandatory increases spatter

Stroke /min	Rated Power		Liner diameter(mm)& Pressure Mpa(psi)
			170		160		150		140		130		120		110		100
			9.4	1365	10.5	1540	12.1	1750	13.9	2010	16.1	2740	22.5	3260	22.5	3260	27.2	3945
	KW	HP	Displacement(L/S)(gal./s)
170	379	515	36.75	9.71	32.56	8.60	28.61	7.56	24.93	6.59	21.49	5.68	18.31	4.84	15.39	4.07	12.72	3.36
165?	373	500	35.67	9.42	31.60	8.35	27.77	7.34	24.19	6.39	20.86	5.51	17.77	4.70	14.93	3.94	12.34	3.26
150	334	455	32.43	8.57	28.73	7.59	25.25	6.67	21.99	5.81	18.96	5.01	16.16	4.27	13.58	3.59	11.22	2.96
140	312	424	30.27	8.00	26.81	7.08	23.56	6.22	20.53	5.42	17.70	4.68	15.08	3.98	12.67	3.35	10.47	2.77
130	290	394	28.11	7.43	24.90	6.58	21.88	5.78	19.06	5.04	16.44	4.34	14.00	3.70	11.77	3.11	9.73	2.57
120	267	364	25.94	6.85	22.98	6.07	20.20	5.34	17.60	4.65	15.17	4.01	12.93	3.42	10.86	2.87	8.98	2.37
110	245	333	23.78	6.28	21.07	5.57	18.52	4.89	16.13	4.26	13.91	3.67	11.85	3.13	9.96	2.63	8.23	2.17.
1			0.2162	0.057	0.1915	0.051	0.1683	0.044	0.1466	0.039	0.1264	0.033	0.1077	0.028	0.0905	0.024	0.0748	0.020