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Hose Connector Type - Focus on Microfluidic Control Technology

Due to the variety of hydraulic hose couplings, how to distinguish and select joints is difficult, so here we briefly introduce the commonly used joint forms.
For hydraulic hose couplings, it is important to maintain the pressure and tightness of the hydraulic system, mainly through the contact surfaces of the connectors. There are currently four main forms:
1. Taper thread seal: After the internal and external threads are connected, the seal is formed by mutual extrusion between the teeth.
2. Soft seal: O-ring on the external thread, through which it is squeezed to form a seal on the mating surface of the internal thread, commonly used in high pressure systems, typical joints such as ORFS
3. Metal seal: Sealed by a certain angle of metal contact surface
4. Metal seal with O-ring: This type of seal is a combination of the front 2, 3 seals, the metal bevels are squeezed against each other, and the O-ring is deformed to form a seal. This seal is especially suitable for high pressure hydraulics. System, typical connectors such as DKOL, DKOS.
The types of hydraulic hose couplings are as follows:
1. Metric 24° taper DIN3865 with O-ring internal thread, eg DKOL, DKOS, and external thread and joint CEL, CES
2. Metric ferrule type steel pipe straight pipe joint, the connecting end is a section of steel pipe
3. American 37° joints conforming to SAE J514/ISO 8434-2, such as AGJ, DKJ
4. American-made flat joints in accordance with SAE J1453/ISO 8434-3 with O-rings such as ORFS
5. Flange joints conforming to SAE J518/ISO 6162, such as SFL, SFS
6. Inch 60° connector in accordance with BS 5200, such as DKR / AGR
7. Metric 60° joint to DIN 3863, such as DKM
8. Taper threaded joints, such as NPTF, BSPT
9. Articulated joints to DIN 7642
At present, the commonly used thread standards in the world are metric, imperial and American. According to the shape, there are two kinds of cylinders and cones.
The metric thread angle is 60° and is in metric units. Both internal and external threads mark its nominal diameter, which is the large diameter. Metric thread representation: M24x1.5, for fine threaded common thread, nominal diameter 24mm, pitch 1.5mm.
The inch thread angle is 55°. The 1/4, 1/2, and 1/8 marks in the thread refer to the nominal diameter of the thread size in inches, as indicated by G1/4, 1 inch = 25.4 mm.
The US thread profile angle is 60°, and the US thread is expressed as follows: Thread diameter - number of teeth per inch series code - accuracy grade, examples such as: fine tooth series 3/8 - 24 UNF - 2A, coarse tooth series 3 / 8 - 16 UNC-2A.

First: metric threaded 24° taper joint with O-ring seal

This type of joint is widely used in Europe and around the world, including China. It can be connected to steel pipe joints of DIN 2353 and DIN EN ISO 8434-1, internally threaded joints
O-ring seal for high pressure hydraulic systems.

Second: metric card sleeve straight pipe joint

At present, the application of such hose joints is relatively small, mainly used in the agricultural machinery industry, and is also divided into light series (PN...FL) and heavy series (PN...FS).
The connection end of this type of joint is actually a steel pipe, and the connection method is a ferrule type connection. For specific card sleeve connection instructions, please refer to the HANSA-FLEX card sleeve connector sample.

Third: US UNF thread, 37° joint (JIC 37°, SAE J514, ISO 8434-2)

The so-called 37° refers to the angle of the sealing bevel. As shown in the figure, the sealing form is a metal seal. This joint is the most widely used in the American standard joint. Initially this joint was designed for use with flared steel pipe joints, so the joint and the 37° hard pipe joint are matched.

Fourth: US UNF thread with O-ring flat seal (ORFS) - SAE J1453/ISO 8534-3

ORFS joints are sealed by O-rings between the plane and the plane, so they have good sealing and vibration resistance and are widely used. As shown in the figure, the male threaded joint has a flat end face with an O-ring groove, and the female threaded joint is an UNF adjustable nut with an inner plane structure.

Fifth: SAE flange joint - SAE J518 / ISO 6162-(1/2) / ISO 12151-3
SAE flange joints were developed for high pressure systems and are used primarily for the connection of pumps, motors, cylinders and hydraulic hoses. They are sealed by compressing the seals in the groove of the end face of the joint to the level of the port.
SAE flange joints are divided into two series according to pressure rating: 3000 psi and 6000 psi (1 bar = 14.5 psi). See the table below for specific pressure values.
In addition to the standard SAE flange joints, HANSA-FLEX also offers CAT joints (designed by Caterpillar, USA) and Komatsu joints (Komatsu).
Flange joints can usually be mounted using split flange clamps or integral flanges.

Sixth: BSP thread 60° cone seal -BS 5200 (DKR, AGR)

Originally derived from the UK design, this connector is currently used worldwide.

Seventh: Metric thread 60° cone seal - DIN 3863 (DKM)
These connectors are also known as DKM types and are primarily used for low pressure. According to DIN 20066 they can be used in hydraulic precision steel tubes for ultra-light series (LL).
The DKM connector of HANSA-FLEX's PN...A does not match the metric threaded joint described above, and the thread is also different.

Eighth: American NPT/NPSM Taper Thread Seal (AGN)

U.S. NPT threaded hose couplings are widely used. These joints are also commonly referred to as AGN types. Taper threads are made in accordance with ANSI/ASMEB 1.20.1-1983. The thread profile angle is 60° and the taper is 1:16. .

Ninth: Articulated joint (RGN)

This type of hose joint is mainly used for places where the joint size is relatively small. It has two parallel sealing faces and is special in shape, so it is easy to identify, as shown in the figure below. These joints are manufactured to DIN 7642 and are available in both metric and BSP threads and are DIN 7643 compliant. These joints, also known as RGN joints, can be either integral or welded, primarily for fiber braided hoses or one or two layers of metal braided hoses.

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