How Do Choose A Good H Type Water Rotary Joint？

In modern industrial equipment, H type water rotary joint are widely used in machine tool cooling systems, plastic machinery, printing equipment, food processing and other fields because of their compact structure, excellent sealing performance and strong adaptability.  However, with a wide variety of products on the market, how to select a truly "easy-to-use, durable, and fit-for-purpose" H type water rotary joint is the focus of many engineers and procurement personnel.

1.  Clarify application requirements: the first step in model selection

Before choosing an H type water rotary joint, it is important to know what conditions it will be used in:The type of transmission medium is it water, coolant, hydraulic fluid, or compressed air?  Different media have different requirements for sealing materials and housing materials.

Operating temperature range：High-temperature environments (e.g., above 100°C) require high-temperature seals;  The frost resistance of the material should be considered at low temperatures.

Maximum operating pressure：The hydraulic system may need to withstand a pressure of up to 1.0MPa, while the pneumatic system is usually between 0.6~1.0MPa.

Rotation speed (RPM)：High-speed rotation (e.g. spindle speed over 3500 rpm) places higher demands on joint seals and bearings.

Installation space limitations:Although the H type water swivel joint is compact, it is still necessary to confirm that the equipment reservation space meets the installation size requirements.

2.  Pay attention to core performance indicators: ensure water rotary joint long-term stable operation

Sealing performance:Seals are one of the most critical components of a rotary joint. High-quality products usually use carbon graphite paired with stainless steel face seal structure, which has good self-lubrication and wear resistance.For corrosive media (e.g. acids and alkalis), PTFE or ceramic-coated seals should be used.

Pressure-bearing capacity:Check the maximum pressure tolerance of your product to ensure that it can meet the pressure needs of your system and avoid leakage or damage due to overpressure.

Friction torque and bearing system: Built-in rolling or plain bearings can effectively reduce rotational resistance, improve running stability and extend service life.The bearing should have good fatigue resistance, especially suitable for high-speed rotation applications.

Number of channels and size of passages:According to the type of transmission medium and the flow rate, select the appropriate number of channels (single or multi-channel) and the size of the diameter.

3. Material selection determines durability

Housing material:Common materials include cast iron, carbon steel, stainless steel, and copper alloys.Stainless steel is suitable for highly corrosive environments, while copper alloys are suitable for lightweight and high-heat dissipation scenarios.

Sealing material:Carbon graphite, ceramics, PTFE, tungsten carbide and other materials have their own advantages and disadvantages, which should be matched according to the specific medium characteristics.

Shaft treatment process:Case-hardening treatments (e.g. nitriding, chrome plating) significantly improve the wear and corrosion resistance of shafts.

4.  Water rotary joint the interface form and installation method should be matched

Connection:Common interfaces include G threads, NPT threads, BSP threads, flanges,  etc., which should be consistent with the field pipeline system.

Mounting direction:Whether it supports vertical installation, horizontal installation or installation at any angle depends on the actual equipment layout.

Shandong Fox Machinery Co., Ltd. is a professional custom swivel joint manufacturer, with special engineers, one-to-one service, will report the price of factory direct sales for you according to the size and quantity of the product you need, the company mainly aims at long-term cooperation, at the same time, as long as the product is sold, the warranty is one year, and there is also after-sales guarantee.