Modular Designed Metering Pump | Milroyal B

The MILROYAL B metering pump is a robust industrial duty metering pump for use in critical processes in oil and gas, chemical and hydrocarbon processes, water and waste treatment, and in most industries where chemical injection is required.

Material (liquid end): 316SS / Alloy 20 / Alloy C22 / PVC (*)
Pressure max: 3,675 psi / 250 bar (metallic liquid end); 150 psi / 10 bar (plastic liquid end); 10,000 psi / 690 bar (packed plunger)
Flow max: 626 gph / 2,370 lph (metallic liquid end); 119 gph / 450 lph (plastic liquid end); 245 gph / 927 lph (packed plunger)
Multiplex: Available
Flow variation control: Manual / Remote
Certifications: API 675, EC, ATEX, IECEX

This product is not available in India.

Modular Design Flexibility

Advanced modular construction supports a wide variety of liquid ends and options, enabling precise customization for specific process requirements.

Adaptable Process Performance

Efficiently handles diverse fluids, pressures, and flow rates, making it suitable for a broad range of demanding industrial applications.

Multiplex System Capability

Multiplex configurations allow multiple pumps to operate together, increasing performance, reliability, and operational flexibility.

Oil & Gas Durability

Designed for harsh offshore environments, delivering consistent injection of methanol, inhibitors, and other corrosive chemicals in extreme conditions.

Pipeline Efficiency (DRA)

Field-proven for drag reducer agent injection, optimizing pipeline flow by reducing turbulence at key network points.

Chemical & Water Processing

Ensures accurate dosing of harsh chemicals in petrochemical and water treatment processes, supporting compliance and long-term cost efficiency.

HIGH PERFORMANCE DIAPHRAGM (HPD) LIQUID END PERFORMANCE

Typical performance based on 1725 RPM, 3 Phase*, 60 Hz motor. Derate flow rates for all other RPM speeds.

Plunger Diameter	Gear Ratio Code	SPM @1725 RPM	Maximum Capacity*		1/3 HP (0.25 kW)		1/2 HP (0.37 kW)		3/4 HP (0.55 kW)		1 HP (0.75 kW)		1 1/2 HP (1.1 kW)		2 HP (1.5 kW)
			Maximum Capacity*		Maximum Discharge Pressure*
			GPH	L/H	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR
7/16 in (11 mm)	8K	49	2.1	7	3,440	237	3,675	250	-	-	-	-	-	-	-	-
	8J	70	3.0	11	1,625	112	3,215	222	3,675	250	-	-	-	-	-	-
	8H	95	4.0	15	1,110	77	2,440	168	3,675	250	-	-	-	-	-	-
	8G	113	4.9	18	775	53	1,905	131	3,675	250	-	-	-	-	-	-
	8F	140	6.1	23	575	40	1,475	102	2,950	203	3,675	250	-	-	-	-
9/16 in (14 mm)	8K	49	3.8	14	1,730	118	2,780	189	3,675	250	-	-	-	-	-	-
	8J	70	5.4	20	975	66	1,830	124	2,750	187	3,675	250	-	-	-	-
	8H	95	7.3	28	650	44	1,350	92	2,030	138	3,055	208	3,675	250	-	-
	8G	113	8.7	33	500	34	1,125	77	1,700	116	2,730	186	3,675	250	-	-
	8F	142	11	42	375	26	900	61	1,350	92	2,400	163	3,600	245	3,675	250
5/8 in (16 mm)	8K	49	7.5	20	1,675	115	2,795	193	3,150	217	-	-	-	-	-	-
	8J	70	7.5	28	755	52	1,170	104	2,700	217	2,885	217	-	-	-	-
	8H	95	10.2	38	510	35	1,170	104	1,755	145	2,885	199	3,150	217	-	-
	8G	113	12.2	46	340	23	910	63	1,755	121	2,390	165	3,150	217	-	-
	8F	142	15.3	57	240	17	700	48	1,445	100	1,930	133	2,895	200	3,150	217
1 in (25 mm)	8K	49	14	53	545	38	875	60	1,250	86	-	-	-	-	-	-
	8J	70	19	72	305	21	575	40	860	59	1,250	86	-	-	-	-
	8H	95	26	98	205	14	420	29	635	44	955	66	1,250	86	-	-
	8G	113	31	117	160	11	355	24	535	37	850	59	1,250	86	-	-
	8F	142	39	148	120	8	285	20	425	29	755	52	1,130	78	1,250	86
1 1⁄4 in (32 mm)	8K	49	21	79	354	24	555	38	770	53	-	-	-	-	-	-
	8J	70	30	114	195	13	365	25	550	38	770	53	-	-	-	-
	8H	95	40	151	130	9	270	19	405	28	610	42	770	53	-	-
	8G	113	48	182	100	7	225	16	340	23	545	38	770	53	-	-
	8F	142	61	231	75	5	180	12	270	19	480	33	720	50	770	53
1½ in (38 mm)	8K	49	34	129	220	15	350	24	500	34	-	-	-	-	-	-
	8J	70	48	182	120	8	230	16	345	24	500	34	-	-	-	-
	8H	95	65	246	80	6	170	12	255	18	385	27	500	34	-	-
	8G	113	77	291	60	4	140	10	215	15	340	23	500	34	-	-
	8F	142	97	367	45	3	110	8	170	12	300	21	455	31	500	34
2 in (51 mm)	8K	49	52	197	140	10	225	16	300	21	-	-	-	-	-	-
	8J	70	75	284	75	5	145	10	220	15	300	21	-	-	-	-
	8H	95	101	382	50	3	105	7	160	11	245	17	300	21	-	-
	8G	113	120	454	-	-	90	6	135	9	220	15	300	21	-	-
	8F	142	151	572	-	-	70	5	105	7	190	13	300	21	-	-
2 1⁄2 in (64 mm)	8K	49	83	314	85	6	140	10	165	11	-	-	-	-	-	-
	8J	70	119 4	50	50	3	90	6	140	10	165	11	-	-	-	-
	8H	95	161	609	-	-	65	4	100	7	155	11	165	11	-	-
	8G	113	191	723	-	-	55	4	85	6 1	35	9	165	11	-	-
	8F	142	240	908	-	-	-	-	65	4	120	8	165	11	-	-
3 1⁄2 in (89 mm)	8K	49	170	643	-	-	70	5	100	7	-	-	-	-	-	-
	8J	70	242	916	-	-	-	-	65	4	100	7	-	-	-	-
	8H	95	330	1249	-	-	-	-	50	3	75	5	100	7	-	-
	8G	113	391	1,480	-	-	-	-	-	-	65	4	100	7	-	-
	8F	142	500	1,892	-	-	-	-	-	-	60	4	90	6	100	7
4 in (102 mm)	8K	49	216	820	-	-	50	3	75	5	-	-	-	-	-	-
	8J	70	308	1,165	-	-	-	-	50	3	75	5	-	-	-	-
	8H	95	419	1,585	-	-	-	-	-	-	60	4	75	5	-	-
	8G	113	498	1,885	-	-	-	-	-	-	50	3	75	5	-	-
	8F	142	626	2,370	-	-	-	-	-	-	45	3	70	5	75	5

Capacities listed are for discharge pressures up to 200 PSIG (14 Bar).

Capacity will decrease 0.8% for each 100 PSIG (7 Bar) over 200 PSIG (14 Bar).

NOTES:

* For single phase motors, increase horsepower by one size — example: increase ½ hp (0.37kW) to ¾ hp (0.55kW).

† Plastic liquid ends are limited to 150 PSIG (10 Bar) @ 68°F (20°C) and are linearly derated to 65 PSIG (4 Bar) @ 140°F (60°C).

‡ Derate capacity by 5% when applying a diaphragm rupture detection system.

Plunger Diameter	Gear Ratio Code	SPM @1725 RPM	Maximum Capacity*		1/3 HP (0.25 kW)		1/2 HP (0.37 kW)		3/4 HP (0.55 kW)		1 HP (0.75 kW)		1 1/2 HP (1.1 kW)		2 HP (1.5 kW)
			Maximum Capacity*		Maximum Discharge Pressure*
			GPH	L/H	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR	PSIG	BAR
7/16 in (11 mm)	8K	49	2.1	7	3,440	237	3,500	241	-	-	-	-	-	-	-	-
	8J	70	3.0	11	1,625	112	3,215	222	3,500	241	-	-	-	-	-	-
	8H	95	4.0	15	1,110	77	2,440	168	3,500	241	-	-	-	-	-	-
	8G	113	4.9	18	775	53	1,905	131	3,500	241	-	-	-	-	-	-
	8F	140	6.1	23	575	40	1,475	102	2,950	203	3,500	241	-	-	-	-
5/8 in (16 mm)	8K	49	5.3	20	1,675	115	2,795	193	3,150	217	-	-	-	-	-	-
	8J	70	7.5	28	755	52	1,515	104	2,700	186	3,150	217	-	-	-	-
	8H	95	10.2	38	510	35	1,170	81	2,100	145	2,885	199	3,150	217	-	-
	8G	113	12.2	46	340	23	910	63	1,755	121	2,390	165	3,150	217	-	-
	8F	142	15.3	57	240	17	700	48	1,445	100	1,930	133	2,895	200	3,150	217
7/8 in (22 mm)	8K	49	9.6	36	800	55	1,385	95	1,500	103	-	-	-	-	-	-
	8J	70	13.8	52	350	24	750	52	1,320	91	1,500	103	-	-	-	-
	8H	95	18.6	70	225	16	560	39	1,025	71	1,500	103	-	-	-	-
	8G	113	22.0	83	140	10	425	29	850	59	1,205	83	1,500	103	-	-
	8F	142	27.6	104	90	6	345	24	740	51	985	68	1,500	103	-	-
1 1⁄8 in (28 mm)	8K	49	16.2	61	460	32	810	56	900	62	-	-	-	-	-	-
	8J	70	23.0	87	185	13	430	30	770	53	900	62	-	-	-	-
	8H	95	31.4	118	115	8	310	21	590	41	900	62	-	-	-	-
	8G	113	37.0	140	65	4	230	16	485	33	720	50	900	62	-	-
	8F	142	47.5	179	35	2	185	13	420	29	595	41	900	62	-	-
1 ½ in (38 mm)	8K	49	28.5	107	2	40	17	17	435	30	500	34	-	-	-	-
	8J	70	41.0	155	90	6	225	16	420	29	500	34	-	-	-	-
	8H	95	56.0	212	45	3	160	11	315	22	500	34	-	-	-	-
	8G	113	67.0	253	-	-	115	8	255	18	400	28	500	34	-	-
	8F	142	84.0	317	-	-	90	6	225	16	335	23	500	34	-	-
1 3⁄4 in (44 mm)	8K	49	39.0	147	175	12	320	22	360	25	-	-	-	-	-	-
	8J	70	55.8	211	55	4	155	11	295	20	360	25	-	-	-	-
	8H	95	76	287	-	-	110	8	225	16	360	25	-	-	-	-
	8G	113	91	344	-	-	75	5	180	12	270	19	360	25	-	-
	8F	142	114	431	-	-	60	4	155	11	220	15	360	25	-	-
2 1⁄2 in (64 mm)	8K	49	83	314	70	5	145	10	165	11	-	-	-	-	-	-
	8J	70	119	451	-	-	60	4	135	9	165	11	-	-	-	-
	8H	95	161	609	-	-	40	3	95	7	165	11	-	-	-	-
	8G	113	190	719	-	-	-	-	70	5	125	9	165	11	-	-
	8F	142	240	908	-	-	-	-	65	4	95	7	165	11	-	-

Capacities listed are for discharge pressures up to 1,000 PSIG (69 Bar).

Capacity will decrease 1.0% for each 100 PSIG (7 Bar) over 1,000 PSIG (69 Bar).

NOTES:

* For single phase motors, increase horsepower by one size — example: increase ½ hp (0.37 kW) to ¾ hp (0.55 kW).

† Plastic liquid ends are limited to 150 PSIG (10 Bar) @ 68°F (20°C) and are linearly derated to 65 PSIG (4 Bar) @ 140°F (60°C).

HPD LIQUID END DIMENSIONS

Material	Plunger Diameter		A‡		B‡		C*		D
Material	in.	mm	in.	mm	in.	mm	in.	mm	in.
Metal (Double Ball) Standard	7⁄16	11	5 5⁄8	121	5 5⁄8	121	4	102	½
	9⁄16	14	5 5⁄8	121	5 5⁄8	121	4	102	½
	5⁄8	16	5 5⁄8	121	5 5⁄8	121	4	102	½
Metal (Single Ball) Standard	1	25	4 13⁄16	122	4 13⁄16	122	6 1⁄8	156	½
	1¼	32	5 7⁄32	133	5 7⁄32	133	6 1⁄8	156	½
	1½	38	7 1⁄16	179	7 1⁄16	179	8 1⁄4	210	1
	2	51	7 9⁄16	192	7 9⁄16	192	8 1⁄4	210	1
	2½	64	7 9⁄16	192	7 9⁄16	192	8 1⁄4	210	1
	3½	89	10 1⁄8	257	10 1⁄8	257	13	330	1½
	4	102	10 1⁄8	257	10 1⁄8	257	13	330	1½
Plastic (Double Ball) Standard	1	25	6½	165	6½	165	6 15⁄16	176	½
	1¼	32	6½	165	6½	165	6 15⁄16	176	½
	1½	38	9 9⁄16	243	9 9⁄16	243	8¾	222	1
	2	51	9 9⁄16	243	9 9⁄16	243	8¾	222	1
	2½	64	9 9⁄16	243	9 9⁄16	243	8¾	222	1
	3½	89	16‡	406‡	13	330	13¼‡	337‡	1½
	4	102	16‡	406‡	13	330	13¼‡	337‡	1½

Notes:

* Dimensions shown are for single diaphragm liquid ends. Contact factory for double diaphragm dimensions.

† A & B dimensions are based on standard ball check configuration: Consult factory for dimensions on optional configurations.

‡ Suction and discharge connections are horizontal in metal and vertical in plastic except on plastic 3½ in (89 mm) plunger & 4 in (102 mm) plunger, where suction is horizontal, discharge is vertical and dimension “C” for discharge is 1013⁄16 in (275 mm).

DISC DIAPHRAGM LIQUID END DIMENSIONS*

Material	Plunger Diameter		I		J		K		L
Material	in.	mm	in.	mm	in.	mm	in.	mm	in.
Metal	7⁄16	11	4 3⁄4	121	5½	140	3	76	½
	5⁄8	16	4 3⁄4	121	5½	140	3	76	½
	7⁄8	22	5 3⁄4	146	6 7⁄8	175	3 7⁄16	87	1
	1 1⁄8	28	5 3⁄4	146	6 7⁄8	175	3 7⁄16	87	1
	1½	38	6 7⁄16	164	7 15⁄16	202	3 5⁄8	92	1 1⁄4
	1 3⁄4	44	6 7⁄16	164	7 15⁄16	202	3 5⁄8	92	1 1⁄4
	2½	64	6 15⁄16	176	10 5⁄16	265	3 7⁄8	98	1½
Plastic	7⁄16	11	4 11⁄16	119	5 7⁄16	138	3 3⁄16	81	½
	5⁄8	16	4 11⁄16	119	5 7⁄16	138	3 3⁄16	81	½
	7⁄8	22	5 1⁄4	133	6 3⁄8	162	3½	89	1
	1 1⁄8	28	5 1⁄4	133	6 3⁄8	162	3½	89	1
	1½	38	6 15⁄16	176	8 7⁄16	214	3 7⁄8	98	1 1⁄4
	1 3⁄4	44	6 15⁄16	176	8 7⁄16	214	3 7⁄8	98	1 1⁄4
	2½	64	7 7⁄16	189	10 15⁄16	278	4 1⁄16	103	1½