TSP-BV Cupla

Medium Pressure up to 75 Bar

The Nitto Kohki TSP-BV Cupla is a brass quick coupling with FKM (fluoroelastomer) seals for medium-pressure service up to 75 bar. The range comprises five socket versions in nominal sizes 2, 3, 4, 6 and 8 (BV-2TSF through BV-8TSF). FKM provides significantly better resistance to mineral oils, fuels, aromatic hydrocarbons and elevated temperatures compared with NBR, qualifying this series for chemically demanding hydraulic and coolant systems.

⚙ Brass body - corrosion-resistant, suitable for hydraulic and coolant media

✓ FKM seal - fluoroelastomer, resistant to mineral oils, fuels and aromatic hydrocarbons

⚡ Nominal sizes 2-8 - socket type (TSF), series BV-2TSF to BV-8TSF

↕ Working pressure up to 75 bar - medium-pressure range, TSP compatible

Part number	Nominal size	Body material	Seal
BV-2TSF	2	Brass	FKM
BV-3TSF	3	Brass	FKM
BV-4TSF	4	Brass	FKM
BV-6TSF	6	Brass	FKM
BV-8TSF	8	Brass	FKM

Typical applications: Hydraulic systems using mineral oil or synthetic hydraulic fluids, metalworking coolant-lubricant installations, chemical process equipment exposed to fuels or solvents, and general medium-pressure line connections up to 75 bar where FKM seals are preferred over NBR for media compatibility reasons.

Technical data from the manufacturer catalogue

Series	TSP CUPLA Socket with Ball Valve
Body material	Brass
Seal material	Fluoro rubber (FKM), Fluoropolymer resin (ball valve part)
Max working pressure	1.0 MPa {10 kgf/cm2}
Working temperature	CUPLA part: Fluoro rubber (FKM): -5 °C to +120 °C
Valve structure	One-way shut-off
Applicable fluids	Water, Hydraulic oil, Air, Gas
Vacuum service	Not suitable for vacuum application in either connected or disconnected condition.
Size range	1/4 inch to 1 inch
Catalogue page	C01en-b, 83

Operating principle

On disconnection the valve in the socket closes the supply line. The fluid left in the plug escapes.

Connecting sequence of a ball locking quick connect coupling.

One-piece design of TSP CUPLA socket and ball valve.
Separation prevention mechanism prevents accidental disconnection during connection (when the valve is open).
The handle of the ball valve locks the sleeve to prevent disconnection of the plug during use.
Socket valve can be opened and shut off while socket and plug are connected.
Ball valve design provides for high flow rate.
High viscosity fluids such as grease can be applied.
Interchangeable with standard TSP CUPLA plug in the same size.
Compact and enhanced sealing design: the connection part between a standard TSP CUPLA socket and a commercially available ball valve is eliminated for enhanced sealing and the overall length is reduced by around 30%.

All models of the series

BV-TSF - Female thread

Model	Coupling part	Application	Brass (g)	L	T	øH(WAF)	øh	øunlabelled	øøD	øød
BV-2TSF	Socket	R 1/4	104	(52.3)	Rc 1/4	Hex.17	(43)	(38.5)	24	5
BV-3TSF	Socket	R 3/8	163	(60.5)	Rc 3/8	Hex.21	(47.5)	(44)	28	7.5
BV-4TSF	Socket	R 1/2	270	(70.3)	Rc 1/2	Hex.26	(53)	(52)	35	9
BV-6TSF	Socket	R 3/4	491	(82.8)	Rc 3/4	Hex.32	(66.1)	(60.5)	45	12.5
BV-8TSF	Socket	R1	904	(102.3)	Rc 1	Hex.41	(76.6)	(76)	58	16

Dimensions in millimetres. Values in brackets apply in the connected condition.

Legend: L = overall length; H = width across flats or outside dimension; D = socket outside diameter; A = hose barb length; C = sleeve dimension; T = thread or barb size; B = bore

Series comparison

Series	Max working pressure	Size range	Valve structure	Applicable fluids
TSP CUPLA Socket with Ball Valve	10 bar	1/4 inch to 1 inch	One-way shut-off	Water, Hydraulic oil, Air, Gas
ZEROSPILL CUPLA	36 bar	1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch (thread)	Two-way shut-off (Spill Reduction)	Water, Hydraulic oil, Chemicals, Air, Gas
SP CUPLA Type A	75 bar	1/8 inch to 2 inch	Two-way shut-off	Water, Hydraulic oil, Chemicals, Air, Gas, Steam
TSP CUPLA	75 bar	1/8 inch to 2 inch (thread and hose)	Straight through	Water, Hydraulic oil, Chemicals, Air, Gas, Steam

Pick the TSP CUPLA Socket with Ball Valve when the line has to be shut off and reopened at the socket while the plug stays connected, which the straight through TSP CUPLA does not provide. It is rated 1.0 MPa {10 kgf/cm2}, so lines working in the 1.5 to 7.5 MPa {15 to 76 kgf/cm2} range of TSP CUPLA and SP CUPLA Type A, or at the 3.5 MPa {35 kgf/cm2} of ZEROSPILL CUPLA, are above its rating. Its valve structure is one-way shut-off, so where both halves have to close on disconnection SP CUPLA Type A or ZEROSPILL CUPLA with their two-way shut-off apply.

Body and seal materials

Body material
Brass

Seal material	Mark	Working temperature	Remarks
CUPLA part: Fluoro rubber (FKM)	-	-5 °C to +120 °C	-
Ball valve part: Fluoropolymer resin	-	-	-

Further catalogue data

Note	Value
Pressure unit conversion	1.0 MPa = 10 kgf/cm2 = 10 bar = 145 PSI
Min. cross-sectional area BV-2TSF	19.6 mm2
Min. cross-sectional area BV-3TSF	44.1 mm2
Min. cross-sectional area BV-4TSF	63.6 mm2
Min. cross-sectional area BV-6TSF	122 mm2
Min. cross-sectional area BV-8TSF	201 mm2
Maximum tightening torque BV-2TSF	9 Nm {92 kgf - cm}
Maximum tightening torque BV-3TSF	12 Nm {122 kgf - cm}
Maximum tightening torque BV-4TSF	30 Nm {306 kgf - cm}
Maximum tightening torque BV-6TSF	50 Nm {510 kgf - cm}
Maximum tightening torque BV-8TSF	65 Nm {663 kgf - cm}
Flow direction	Fluid flow can be bi-directional when socket and plug are connected.
Accessory	CUPLA ADAPTER for Braided Hose Connection, can be screwed into CUPLA with female threads 3/8 inch, 1/2 inch, 3/4 inch (see page 166).
Flow rate	Flow rate - pressure loss characteristics chart on page 84 for BV-2TSF to BV-8TSF. Test conditions: fluid hydraulic oil, temperature 30 deg C, fluid viscosity 32x10-6 m2/s, density 0.87x103 kg/m3. Chart range 1 to 1000 L/min against 0.01 to 1.0 MPa {0.1 to 10 kgf/cm2} pressure loss.

Interchangeability and size groups

TSP CUPLA plugs of the same size can be connected regardless of end configurations. Interchangeable with the standard TSP CUPLA plug in the same size.

Safety and application notes

Before use, please be sure to read the Safety Guide described at the end of the catalogue and the Instruction Sheet that comes with the products.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 83. The complete catalogue is available for download on this page.

What are Nitto Kohki TSP-BV Cupla quick couplings and their primary industrial applications?

Nitto Kohki TSP-BV Cupla quick couplings are brass pneumatic connectors designed for medium pressure applications up to 75 bar, featuring FKM sealing for chemical resistance. These couplings serve critical roles in automated manufacturing lines, pneumatic tool circuits, and compressed air distribution systems where rapid connection and disconnection under pressure is required. The brass construction with fluoroelastomer sealing makes them particularly suitable for industrial environments with aggressive media exposure, including automotive assembly, food processing equipment, and chemical processing applications requiring reliable pressure containment and leak-free operation.

What are the key technical selection criteria for Nitto Kohki TSP-BV Cupla couplings?

Selection of Nitto Kohki TSP-BV Cupla couplings requires matching the port size designation to system requirements, with available sizes ranging from BV-2TSF through BV-8TSF indicating different flow capacities and connection diameters. The maximum operating pressure of 75 bar determines suitability for medium pressure pneumatic systems, while the brass body material provides corrosion resistance for most industrial media. FKM seal material compatibility must be verified against system fluids, as fluoroelastomer seals maintain integrity across temperature ranges typically from -20°C to +200°C and resist aggressive chemicals including oils, fuels, and many solvents commonly found in industrial pneumatic applications.

Which international standards and certifications apply to TSP-BV Cupla quick couplings?

Nitto Kohki TSP-BV Cupla couplings typically comply with ISO 4414 pneumatic system safety requirements and ISO 7241 quick coupling dimensional standards for interchangeability with other pneumatic components. The brass construction and FKM sealing materials meet DIN EN 12266 pressure testing requirements for industrial valve applications, while the 75 bar pressure rating aligns with EN 983 safety requirements for pneumatic equipment in potentially hazardous environments. Additional compliance may include RoHS directive requirements for material composition and REACH regulation compliance for chemical substances, ensuring safe deployment across European industrial applications requiring documented material traceability.

What are the differences between the main TSP-BV Cupla product variants available?

The primary differentiation between Nitto Kohki TSP-BV Cupla variants lies in the port size designation, with models BV-2TSF, BV-3TSF, BV-4TSF, BV-6TSF, and BV-8TSF offering progressively larger flow capacities and connection diameters for different pneumatic system requirements. All variants maintain identical brass body construction with FKM sealing for consistent chemical resistance and 75 bar maximum operating pressure capability across the entire product range. The numerical designation correlates to the nominal pipe size compatibility, allowing engineers to select appropriate flow capacity while maintaining standardized connection interfaces, pressure ratings, and sealing performance characteristics throughout pneumatic system installations requiring multiple coupling sizes.

What are the installation requirements and system compatibility considerations for TSP-BV Cupla couplings?

TSP-BV Cupla installation requires proper thread engagement with adequate sealant application to prevent leakage, typically using PTFE tape or thread compound rated for the system's maximum 75 bar operating pressure. The couplings feature standard threaded connections compatible with most pneumatic system components, requiring torque values according to the specific port size to prevent over-tightening that could damage the brass threads or under-tightening that compromises pressure integrity. System compatibility depends on media cleanliness requirements, as the FKM seals perform optimally with filtered compressed air or compatible hydraulic fluids, while the brass construction requires consideration of galvanic corrosion potential when connected to dissimilar metals in the presence of moisture or conductive fluids.

What safety ratings and environmental operating parameters apply to TSP-BV Cupla couplings?

Nitto Kohki TSP-BV Cupla couplings operate safely at maximum pressures up to 75 bar with brass body construction providing mechanical strength and FKM sealing maintaining integrity across industrial temperature ranges typically from -20°C to +200°C depending on specific media compatibility. The couplings do not carry specific IP protection ratings as they are designed for internal pneumatic system use rather than external environmental exposure, but the brass construction provides natural corrosion resistance in most industrial atmospheres. Safety operation requires regular pressure testing according to facility maintenance schedules and immediate replacement if visual inspection reveals seal degradation, thread damage, or pressure drop indicating internal wear that could compromise the 75 bar pressure containment capability.

What maintenance schedule and service life expectations apply to TSP-BV Cupla quick couplings?

TSP-BV Cupla maintenance requires quarterly visual inspection for seal degradation, thread wear, and proper engagement under the 75 bar operating pressure, with immediate replacement recommended if leakage or pressure drop occurs during routine system checks. The FKM seals typically provide 2-5 years service life depending on cycling frequency, media compatibility, and temperature exposure, while the brass body construction offers extended operational life when properly maintained and protected from corrosive environments. Annual pressure testing at 1.5 times working pressure verifies continued integrity, and replacement intervals should consider total connection cycles, as frequent coupling and uncoupling operations accelerate wear on both the threading and sealing surfaces compared to permanently connected installations in pneumatic distribution systems.