The FOX HSTX Series Diaphragm Pulsation Damper is a hydraulic component of fundamental importance for fluid contamination control and the correct management of pressure fluctuations within advanced hydraulic systems. For correct use of the device as a pulsation damper, the nitrogen pre-charge pressure must be accurately calibrated within a specific range between 60% and 80% of the working pressure of the entire system. This calibration must always be calculated by duly considering the type of pump installed and the expected operating temperature values. The compression ratio recommended by the engineering parameters is 2.5, while the maximum permitted limit must not exceed 4. It is also essential to emphasise that the mechanical life of the component is inversely proportional to the increase in the compression ratio applied to the circuit.

Construction and Materials

The main body of the device is entirely made of AISI 316 L stainless steel, a metallurgical choice that provides exceptional mechanical strength and high corrosion resistance, also suitable for the most aggressive industrial environments. The internal diaphragms, which play a vital role in the correct operation of the damper, are available in different high-performance technical compounds, specifically NBR, HNBR, EPDM, FPM and HYTREL. This variety ensures perfect chemical compatibility with multiple fluids and guarantees impeccable sealing at different operating temperatures. The nitrogen valve supplied as standard equipment is UNF type, and the device offers considerable installation flexibility, as it can be mounted in either horizontal or vertical position, provided that the nitrogen valve is strictly oriented upwards. The maximum working pressure supported ranges from 150 to 210 bar depending on the specific model selected, with a test pressure calculated by multiplying the working pressure by factors of 1.43, 1.3 or 1.5.

Configurations and Certifications on Request

The manufacturer offers countless customisations on request to adapt the component to the most specific and extreme design requirements. The external body can be painted according to the standard FOX procedure or in compliance with strict project specifications provided by the client. Various types of connections are also available to interface with any system, including SAE 3000 and SAE 6000 flange connections, ANSI B16.5 fittings, UNI/DIN standards, Autoclave connections, Grayloc systems, integrated flange options and special connections made entirely according to the customer’s specific request. For the most severe applications requiring extraordinary performance, a special high-pressure version is available, capable of operating safely up to 1379 bar, equivalent to 20,000 PSI. It is also possible to opt for the product version made with special exotic materials or to request the fully maintenance-free version, identified by the technical designation HSTX-SMF. To complete the offering and ensure maximum operating safety, the products can be supplied on request in compliance with a broad and complete range of international industry certifications, including CE PED, ATEX, ASME, KOSHA, SELO and many other globally relevant standards.

Summary Technical Table

Summary technical table of the main features.