RX™ Rotary Joints/The Nippon Joint, Ltd.

RX™ Rotary Joints

The RX rotary joint uses a balanced seal with special ball bearing or optional tapered roller bearings to support the rotor. This rotary joint from Kadant Johnson incorporates the latest technology in mechanical seal design for water and hot oil service. The high thrust load capability and carbon-to-silicon (or Tungsten) carbide seal package makes the RX run longer and with less maintenance requirements that other ball bearing designs. All O-rings are fully captured in glands and seal-loading springs do not contact the process fluid. The RX features a barrier in the seal chamber to extend bearing life and a nipple and assembly plate made of stainless steel. Available in single- and dual-flow configurations and sizes from 3/8” to 6”, the RX rotary joint is capable of operating up to 500° F (260° C), 150 psig (10 bar), and 750 RPM.

Features

Springs located outside the flow area
Stainless steel rotor
Two-piece housing, on-machine seal replacement
O-rings fully captured in glands
Balanced seal assembly
Full flow area
Matched seal faces
Bearing isolation system available
Tungsten carbide counterseat

Benefits

Improved reliability, increased flow area
Corrosion resistant
Reduced down-time and cost of maintenance
Robust design, no risk of o-ring slipping
Extended operating life
Low pressure drop
Materials selected for specific service
Increased bearing protection
Added toughness and shock resistance

Specifications

Max. Pressure	Max. Temperature	Max. Speed	Fluid
1.3MPa	250°C	1,000rpm	Steam/Water/Hot Oil

Single:Threaded

Dual:Threaded

Threaded:Single·Dual Flow

Unit:mm

Type	Size	M	P	S	A	C	D	F	G	J1	J2
4200RX	2"	1 1/4", 2"	1", 1 1/4"	1 1/4"	49	143	229	56	309	280	336
4250RX	2 1/2"	2 1/2"	1 1/4", 1 1/2", 2"	1 1/2"	61	174	271	72	371	334	402
4300RX	3"	2", 3"	1 1/4" - 2"	1 1/2", 2"	74	200	327	92	453	397	491

*Dimensions are subject to change without any advanced notice.

Single:Flanged

Dual:Flanged

Flanged:Single·Dual Flow

Unit:mm

Type	Size(K)	タイプ	M	P	S	A	B	C	D	E	F
4200RX	2"	Single	2"	-	-	353	272	-	211	162	94
4200RX	2"	Dual	1"	1"	1 1/4"	401	344	222	211	162	102
4250RX	2 1/2"	Single	2 1/2"	-	-	397	311	-	211	162	104
4250RX	2 1/2"	Dual	1 1/2"	1 1/2"	1 1/2"	487	419	262	211	162	117
4300RX	3"	Single	3"	-	-	449	349	-	102	192	124
4300RX	3"	Dual	2"	2"	2"	565	474	304	102	192	130

*For 2" and 2 1/2" sizes, the ’D’ dimension is the ID of the counterbore. Counterbore depth is 0.25"(6.4mm). For 3" size, the ’D’ dimension is the OD of the pilot. Pilot depth 0.30"(7.6mm). Drawings show the integral flanged nipple with pilot.

*Dimensions are subject to change without any advanced notice.

Specifications

Max. Pressure	Max. Temperature	Max. Speed	Fluid
1MPa	150°C	750rpm	Water

Single:Threaded

Dual:Threaded

Threaded:Single·Dual Flow

Unit:mm

Type	Size(K)	Type	M	P	S	A	B	C	D	E	F	G
4400RX	4"	Single	4"	-	-	484	415	-	120	229	168	-
4400RX	4"	Dual	2 1/2"	2 1/2"	2 1/2"	530	484	334	120	229	76	111

*Counterbore depth=7.6mm

*Dimensions are subject to change without any advanced notice.

Single:Flanged

Dual:Flanged

Flanged:Single·Dual Flow

Unit:mm

Type	Size(K)	Type	M	P	S	A	B	C	D	E	F	G
4400RX	4"	Single	4"	-	-	530	415	-	120	229	165	-
4400RX	4"	Dual	2 1/2"	2 1/2"	2 1/2"	677	582	343	120	229	133	181
4500RX	5"	Single	5"	-	-	583	485	-	160	225	194	-
4500RX	5"	Dual	3"	3"	3"	756	661	428	160	225	140	212

*Counterbore depth=7.6mm

*Dimensions are subject to change without any advanced notice.

Specifications

Max. Pressure	Max. Temperature	Max. Speed	Fluid
1MPa	250°C	750rpm	Water/Hot Oil

Single:Threaded

Dual:Threaded

Threaded:Single·Dual Flow

Unit:mm

Type	Size(K)	Type	M	P	S	A	B	C	D	E	F	G
4400RX	4"	Single	4"	-	-	538	469	-	120	229	168	-
4400RX	4"	Dual	2 1/2"	2 1/2"	2 1/2"	582	536	386	120	229	76	111

*Counterbore depth=7.6mm

*Dimensions are subject to change without any advanced notice.

Single:Flanged

Dual:Flanged

Flanged:Single·Dual Flow

Unit:mm

Type	Size(K)	Type	M	P	S	A	B	C	D	E	F	G
4400RX	4"	Single	4"	-	-	584	469	-	120	229	165	-
4400RX	4"	Dual	2 1/2"	2 1/2"	2 1/2"	730	636	397	120	229	133	181
4500RX	5"	Single	5"	-	-	617	486	-	160	225	194	-
4500RX	5"	Dual	3"	3"	3"	757	662	428	160	225	140	212
4600RX	6"	Single	6"	-	-	657	517	-	176	248	227	-
4600RX	6"	Dual	4"	4"	4"	887	773	498	176	248	178	229

*Counterbore depth for 4"=7.6mm
*Counterbore depth for 5"=14.2mm

*Dimensions are subject to change without any advanced notice.

RX Rotary Joint (Size:3/8" - 1 1/2")

Standard Specifications

Max. Pressure	Max. Temperature
1.3MPa	105°C
Max. Speed	Fluid
3,500rpm	Water/Air

*Consult us for RX-1, RX-2, and RX-3 unions for applications up to 450°F (232°C).

RXA：Single(Threaded)

RXB2：Dual(Threaded)

Threaded:Single·Dual Flow

Unit:mm

Type	Size(K)	A	C	D	F	G	H	J1	J2	M	P	S
4038RXA 4038RXB2	3/8" NPT	10	64	100	10	138	117	119	153	3/8"	1/4"	1/4"
	5/8" - 18 UNF	10	64	100	16	138	117	119	153	3/8"	1/4"	1/4"
	3/8" BSP	10	64	100	16	138	123	119	153	3/8"	1/4"	M6×1"
4050RXA 4050RXB2	1/2" NPT	13	64	102	13	138	117	122	153	1/2"	3/8"	1/8"
	3/4" - 16 UNF	13	64	102	19	138	117	122	153	1/2"	3/8"	1/8"
	1/2" BSP	13	64	102	19	138	123	122	153	1/2"	3/8"	1/8"
4075RXA 4075RXB2	3/4" NPT	17	73	113	14	156	133	138	173	3/4"	1/2"	1/4"
	1" - 14 UNF	17	73	113	19	156	133	138	173	3/4"	1/2"	1/4"
	3/4" BSP	17	73	113	19	156	134	138	173	3/4"	1/2"	1/4"
4100RXA 4100RXB2	1" NPT	25	91	138	17	193	164	166	213	1"	1/2"	3/8"
	1 1/2" - 12 UNF	25	91	138	28	193	171	166	213	1"	1/2"	3/8"
	1" BSP	25	91	138	28	193	171	166	213	1"	1/2"	3/8"
4125RXA 4125RXB2	1 1/4" NPT	32	96	155	17	222	200	189	247	1 1/4"	1"	1/2"
	1 3/4" - 12 UNF	32	96	155	30	222	200	189	247	1 1/4"	1"	1/2"
	1 1/4" BSP	32	96	155	30	222	200	189	247	1 1/4"	1"	1/2"
4150RXA 4150RB2	1 1/2" NPT	38	116	174	17	243	206	212	268	1 1/2"	3/4"	3/4"
	2" - 12 UNF	38	116	182	28	250	214	220	276	1 1/2"	3/4"	3/4"
	1 1/2" BSP	38	116	182	28	250	214	220	276	1 1/2"	3/4"	3/4"

*Dimensions are subject to change without any advanced notice.

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