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GP SERIES
Rotary Union Solutions
Contents
A rotary union (or swivel joint) is a mechanism used
to transfer fl uid (under pressure or vacuum) from a
stationary inlet to a rotating outlet, preserving and
isolating the fl uid connection.
Rotary unions are engineered to endure a wide
range of temperatures and pressures for a variety of
conditions and environments. In addition, rotary unions
may integrate multiple passages and handle different
types of fl uid simultaneously.
See examples at www.dsti.com/industries
Housing
Bearings
Seals
Shaft
Retaining Ring
Flow Channel (Passage)
Housing Connections (x6)
Independent Flow Chann w Channels (x6)
(6 Passage Model Example)
How do I choose the best rotary union for
my application?
Tell us about your requirements so we can
make a recommendation:
1) Type of media(s) / fl uid(s) to be transferred
2) Number of independent fl ow channels (passages)
3) Operating pressure
4) Operating temperature
5) Operating speed
6) Shaft & housing connection type
7) Flow channel (passage) size
8) Torque & load requirements
9) Duty cycle*
*Does the temperature, speed or pressure fl uctuate
or change during operation? If so, please provide the
detailed ranges for each parameter and time durations
of each condition.
Flow Channel(Passage)
Shaft Connections (x6)
What is a Rotary Union?
3
phone 866.700.3784 | web www.dsti.com
GP Series Overview
+ General Purpose
+ NPT / BSPP / O-Ring Connection Options
+ Available in Stainless Steel
+ Exclusive DynaSeal? Seals
+ Reliable Usage With Dissimilar Medias
+ Customized Options
GP SERIES
Rotary Union Solutions
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Download STEP, DWG, and PDF resources.
View interactive 3D models and more!
Learn more at www.dsti.com
ON THE WEB
How to Order: Create your Part Number
GP GP Series (NPT2 Connection)
1 1/8” (3.175 mm) Passage Size
2 1/4” (6.350 mm) Passage Size
3 3/8” (9.525 mm) Passage Size
5 3/4” (19.05 mm) Passage Size
6 1” (25.40 mm) Passage Size
4 1/2” (12.70 mm) Passage Size
2 2 Flow Passages
3 3 Flow Passages
4 4 Flow Passages
6 6 Flow Passages
1 With Thru-bore1
0 No Thru-bore1
GPM 2 2 1 OF ES12 C1 PMX
OPTIONS See Next Page
GPM GP Series (BSPP3 Connection)
GPS GP Series Stainless Steel (NPT2 Connection)
GPSM GP Series Stainless Steel (BSPP3 Connection)
EXAMPLE
EXAMPLES
GP-240
■ GP 4 Passage, 1/4” NPT Connections
GPM-341
■ GP 4 Passage with thru-bore, 3/8” BSPP Connections
GPSM-301-10
■ GP 10 Passage with thru-bore, 3/8” BSPP Connections
(Stainless Steel)
8 8 Flow Passages
01-10 10 Flow Passages
01-12 12 Flow Passages
NOTE Thru-bore standard
on all 10 and 12 fl ow
passage models
1 This digit not used in naming convention of 10 or 12 fl ow passage models.
2 NPT with O-ring shaft connection.
3 O-ring not available for metric connections.
Shaft O-ring face seal connection standard on all GP
models excluding the 10 or 12 fl ow passage models
and BSPP models . For a shaft O-ring face seal
connection on a 10 or 12 passage model, please call
out the “OF” option when naming the part number.
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Rotary Union Solutions
ESTx 6 - 24 Circuits
600 Volts
Optional Electrical Slip Rings Optional Electrical Slip Rings
OF Add “- OF” for Shaft O-ring Face Seal Option1
Optional Electrical Slip Rings2
C1 Cover For ES and ESM Series Slip Rings
NOTE Only available
for GP-1x1 models
NOTE Not available
for GP-1x1 models
EXAMPLE
GP-241-EST6
GP 4 Passage model with thru-bore, 1/4” NPT
connections with a EST6 electrical slip ring.
OF
GPM-201-10
ESM36
C1
GP-241
EST6
ADAPTER
EXAMPLE
GPM-201-10-OF-ESM36-C1
GP 10 Passage with thru-bore, 1/4” BSPP
connections with a shaft O-Ring face seal
option and an ES6 electrical slip ring with cover.
GPM 2 2 1 OF ES12 C1
EXAMPLE
1 "-OF" option is only available on GP 10 & 12
passage models.
2 Pin connector and cord set options also
available. Please contact DSTI for more
information.
Omit “-OF” for all GP models except for GP 10 & 12 passage.
ES6A 6 Circuit, 120 Volts
ES12A 12 Circuit, 120 Volts
ESMx 9 - 52 Circuits
120/210 Volts
ESx 6 - 56 Circuits
210 Volts
ESEx
8 - 51 Circuits
240 Volts
Ethernet
ESETx
4 - 22 Circuits
600 Volts
Ethernet
(see Electrical Slip Ring Options on
page 25 for full specifi cations)
How to Order: Choose your Options
Media Types Coolant, Gases, Oil, Steam1, Water1
Passage Sizes 1/8”, 1/4”, 3/8”, 1/2”, 3/4”, 1” (3.18 mm, 6.35 mm, 9.53 mm, 12.7 mm, 19.1 mm, 25.4 mm)
Connection Type NPT, BSPP, O-Ring
Max. Operating Pressure 7500 PSI (515 BAR)2
Max. Vacuum 30 HG2
Max. Rotational Speed 500 RPM2
Operating Temperature 0o F to 350o F (-18o C to 176o C)3
Body Material Type Carbon Steel, Stainless Steel
Platings and Coatings Black Oxide, Thin Dense Chrome
Slip Ring Options See page 25
Mounting Options Tapped holes on housing end / Slotted fl ange or tapped holes at shaft end
Seal Type Filled PTFE (Alternative seal types available. Please consult with DSTI)
Shaft
O-Ring Gland
1 Stainless Steel recommended for all water/steam applications.
2 Values are dependent on a combination of all application parameters. Please consult with DSTI.
3 High temperature applications may require alternative seal materials. Please consult with DSTI.
Independent Flow Passages
Bearings
Seals
Bearings
Retaining Ring
Housing
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phone 866.700.3784 | web www.dsti.com
Flow Passage Options 2 3 4 6 8 10 12
Specifications & Operating Information
Performance Data: Pressure vs. Speed (Continuous)
GP-x2x Series
0
50
150
250
 350
450
550
100
200
300
400
 500
 600
0 1000
(69 BAR)
2000
(138 BAR)
3000
(207 BAR)
4000
(276 BAR)
5000
(345 BAR)
6000
(414 BAR)
7500
(515 BAR)
PRESSURE PSI (BAR)
SPEED (RPM)
GP-120
GP-121, GP-220
GP-320
GP-221, GP-420
GP-321
GP-421
GP-621
GP-x3x Series
400
350
300
250
200
150
100
50
0
0 1000 (69 BAR)
2000
(138 BAR)
3000
(207 BAR)
4000
(276 BAR)
5000
(345 BAR)
6000
(414 BAR)
7500
(515 BAR)
PRESSURE PSI (BAR)
SPEED (RPM)
GP-130
GP-131
GP-230
GP-231, GP-330
GP-331, GP-430
GP-431, GP-530
GP-630
* This data is to be used as
a general guideline. Data
based on hydraulic fl uid
as the media type. Please
consult DSTI about your
specifi c application.
* This data is to be used as
a general guideline. Data
based on hydraulic fl uid
as the media type. Please
consult DSTI about your
specifi c application.
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Rotary Union Solutions
GP-x4x Series
400
350
300
250
200
150
100
50
0
0 1000 (69 BAR)
2000
(138 BAR)
3000
(207 BAR)
4000
(276 BAR)
5000
(345 BAR)
6000
(414 BAR)
7500
(515 BAR)
PRESSURE PSI (BAR)
SPEED (RPM)
GP-140
GP-141
GP-240
GP-241, GP-340
GP-341, GP-440
GP-441, GP-540
GP-641
GP-x6x Series
300
250
200
150
100
50
0
0 1000 (69 BAR)
2000
(138 BAR)
3000
(207 BAR)
4000
(276 BAR)
5000
(345 BAR)
6000
(414 BAR)
7500
(515 BAR)
PRESSURE PSI (BAR)
SPEED (RPM)
GP-161
GP-261
GP-361
GP-460
GP-561
* This data is to be used as
a general guideline. Data
based on hydraulic fl uid
as the media type. Please
consult DSTI about your
specifi c application.
* This data is to be used as
a general guideline. Data
based on hydraulic fl uid
as the media type. Please
consult DSTI about your
specifi c application.
9
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Rotary Union Solutions
GP-x8x Series
300
250
200
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接头和转接头

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