TOZEN / Tozen Industrial expansion joints and fluid control systems

TOZEN / Tozen Industrial engineering products: Twinflex rubber joints, SJT bellows, PTM spring isolators, BFV butterfly valves, and SCV-W check valves.

TOZEN Twinflex double-sphere rubber flexible expansion joints

TOZEN Twinflex series double-sphere rubber expansion joints are manufactured from synthetic neoprene to absorb pipe vibrations, noise, and pressure surges in fluid lines. Outfitted with floating FCD ductile iron flanges, units handle operating pressures up to 20 bar at 100 °C.

Suppression of longitudinal displacement, lateral offset, and angular motion
Nominal bore sizes from 15 to 300 mm with threaded socket and flanged unions
Reinforced neoprene elastomer envelope designed for continuous pump station duty
Installation at pump intake and discharge nozzles to mitigate mechanical shock

TOZEN Tozenflex single-sphere flexible rubber connectors

TOZEN Tozenflex single-sphere connectors are fabricated from rugged EPDM elastomer for heating, chilled water, and industrial HVAC fluid loops. The spherical arch attenuates vibration transmission, dampens sound waves, and compensates for thermal movements in tight pipe runs.

Rated working pressure of 16 bar across all standard diameters from 40 to 300 mm
Resilient EPDM compound resisting hot water degradation and glycol formulations
Freely rotating floating steel flanges conforming to ANSI 150 and JIS 10K drillings
Compact face-to-face dimensions facilitating installation in tight header spaces

TOZEN SJT series stainless steel bellows expansion joints

TOZEN SJT1100 and SJT1200 metallic expansion joints integrate multi-ply corrugated bellows of SUS 304 or 316L stainless steel for high temperature and high pressure duty. The precision bellows absorb thermal elongation in steam mains, district heating, and process duct lines.

Multi-ply corrugated bellows formed from SUS 304, 316L, or high-temp 321 alloys
Available with butt-weld ends or flanged fittings with internal flow sleeves
Absorption of axial expansion in steam pipelines running up to 300 degrees C
Protective steel shrouds and factory pre-setting shipping bars for alignment

TOZEN PTM series floor-mounted spring vibration isolators

TOZEN floor vibration isolators are engineered to JIS B2704 standards for heavy chillers, cooling towers, centrifugal blowers, and motor sets. PTM-A, PTM-C, and seismic PTM-D lines eliminate structural noise transfer and absorb dynamic cyclic loads before reaching floor slabs.

Extensive load-bearing envelope from 25 kg up to 11,200 kg per mounting point
Standard rated static spring deflection of 25 mm with selections up to 100 mm
Integrated elastomer ribbed pads providing acoustic isolation of high frequencies
Leveling cap screws enabling rapid mechanical plane adjustment on uneven floors

TOZEN BFV, BFV-L, and BFV-D industrial butterfly valves

TOZEN butterfly valves are supplied in wafer BFV, lugged BFV-L, and flanged BFV-D styles for isolation and flow modulation in fluid piping networks. Face-to-face lengths adhere to ISO 5752 series 20, while top actuator mounting flanges meet international ISO 5211 criteria.

Size range spanning 50 to 800 mm with bi-directional bubble-tight shutoff to 16 bar
Molded EPDM and NBR liners preventing fluid interaction with the metallic housing
Discs engineered in FCD 400 iron, SCS 14 stainless steel, or ALBC 2 aluminum bronze
Operation through manual levers, worm gear handwheels, or electric actuator units

TOZEN SCV-W silent check valves and YF series strainers

TOZEN SCV-W dual-plate wafer silent check valves prevent backflow and eliminate water hammer upon pump shutdown cycles. Heavy ductile YF150 strainers screen debris, welding slag, and particulate scale, shielding downstream pump impellers and fragile instrumentation sensors.

Dual-plate spring-assisted flap mechanism made of SCS 14 steel or ALBC 2 bronze
Rapid smooth closure preventing destructive pressure waves and pipeline slamming
Y-pattern strainer bodies with threaded blow-off drain ports for inline flushing
Horizontal or vertical orientation fitting directly onto pump discharge headers

Engineering foundation and historical development of TOZEN movement control

International engineering group TOZEN initiated fluid movement research and component manufacturing in August 1972, founded in Tokyo by Japanese engineer Sankichi Muroi. The primary breakthrough of the enterprise involved designing and commercializing the twin-sphere molded rubber flexible joint.

Prior to this design leap, mechanical engineers responsible for tall skyscraper utility towers and industrial pumping facilities experienced recurring piping flange fractures because conventional single-sphere joints could not accommodate multi-directional displacement envelopes.

In May 1989, manufacturing infrastructure expanded through the establishment of Tozen Industrial Co., Ltd. located in Bangkok, Thailand.

Today, specialized TOZEN fabrication facilities situated in Japan, Thailand, and China (Shanghai Tozen) produce flexible rubber connectors, corrugated stainless steel bellows, precision spring vibration isolators, and industrial valves.

All units undergo hydrostatic pressure inspection and satisfy rigorous international engineering quality benchmarks.

Design mechanics and fluid dynamics of Twinflex and Tozenflex rubber connectors

TOZEN Twinflex twin-sphere flexible connectors install immediately adjacent to fluid delivery and suction ports of industrial pump sets, refrigeration chillers, and rotary compressors.

Incorporating two balanced spherical arches provides increased longitudinal deflection and lateral travel with minimal elastomer stiffness.

The inner seamless liner formulated from synthetic neoprene or EPDM synthetic rubber minimizes fluid turbulence and cavitation wear at fluid flow velocities up to 5 meters per second.

To prevent internal rubber bead slippage from metallic flange retainers, continuous high-tensile steel wire rings are vulcanized directly into the collar profile.

Floating flanges forged from ductile iron alloy FCD rotate freely around the molded bead, simplifying bolt hole alignment when mating with ANSI 150 or JIS 10K counter-flanges.

For demanding industrial piping circuits, reinforced Twinflex 20 units provide heavy-duty capability rated for 20 bar continuous fluid pressure.

Materials metallurgy and thermal expansion engineering of SJT series bellows

TOZEN SJT1100 and SJT1200 metallic bellows expansion joints serve industrial pipelines where high operating temperatures or aggressive media prohibit elastomeric compounds.

The flexible convoluted envelope is formed through hydraulic forming from multi-ply thin-gauge sheets of austenitic stainless steel grades SUS 304, SUS 316L, or titanium-stabilized SUS 321.

The multi-ply architecture reduces joint spring rates while maintaining high burst endurance during cyclic pressure pulsations.

When designing compensation stations for superheated steam mains running at temperatures up to 300 degrees C, engineers determine pre-tensioning dimensions based on ambient installation temperature.

Internal telescopic flow liners shield thin bellows convolutions against particulate erosion and prevent flow-induced resonance at elevated steam velocities. External heavy-gauge steel shrouds protect delicate corrugations against inadvertent tool impact and welding spatter.

Acoustic attenuation and deflection dynamics of TOZEN PTM series spring mounts

Low-frequency structural noise generated by massive rotary chillers, cooling tower fans, and high-pressure compressors transmits through structural building slabs unless isolated by TOZEN spring mounts.

The helical steel springs comply strictly with Japanese standard JIS B2704 for permanent service life. The ratio of horizontal spring stiffness to vertical stiffness exceeds 0.8, ensuring dependable lateral stability without requiring supplementary snubber guides.

The PTM-A series features free-standing open spring units equipped with stamped steel retainers cushioned by molded elastomer pads.

For installations exposed to lateral wind forces or sudden water drainage weight fluctuations, seismic PTM-D isolators feature welded structural steel housings with heavy vertical restraint pins.

Bonded beneath all base plates, ribbed 8 mm thick PT-MAT elastomer pads isolate high-frequency acoustic bridge transmissions through foundation anchor bolts.

Precision machining and flow isolation performance of BFV series butterfly valves

TOZEN BFV, BFV-L, and BFV-D industrial butterfly valves provide positive flow isolation and flow throttling across HVAC, municipal waterworks, and industrial fluid utilities.

Valve face-to-face dimensions conform to ISO 5752 series 20, guaranteeing drop-in interchangeability with international piping components.

The top mounting pad conforms to ISO 5211, enabling straightforward interface with manual worm gear operators, double-acting pneumatic actuators, and electric motor actuators.

Bubble-tight bidirectional sealing is achieved through precision machining of the spherical disc edge seating against a resilient elastomer liner.

The molded EPDM or NBR rubber liner extends over valve faces to serve as integrated flange gaskets, eliminating the need for auxiliary gasket sheets during pipe bolting.

The high-strength shaft formed of stainless steel SUS 416 or 316 features blowout-proof retention inside the iron housing, ensuring smooth rotation with low mechanical torque.

Water hammer mitigation and particulate screening via SCV-W valves and YF150 strainers

Abrupt pump shutdown triggers severe water hammer pressure waves capable of rupturing pipe joints and expensive plant equipment.

TOZEN SCV-W dual-plate wafer silent check valves mitigate this dynamic risk using spring-assisted dual plates fabricated from SCS 14 stainless steel or ALBC 2 aluminum bronze.

Heavy-duty SUS 316 torsion springs initiate rapid closure as fluid forward velocity decelerates, arresting reverse flow before slamming occurs.

To protect sensitive pump impellers and flowmeters against welding slag, mill scale, and debris, TOZEN YF150 Y-pattern strainers are installed upstream in iron alloy FC20 bodies. A precision stainless steel mesh screen captures solid particulates without inducing excessive system head loss.

The removable bottom cover incorporates a threaded plug accommodating a drain ball valve for routine blowdown flushing of accumulated sediment without dismantling line piping.

TOZEN / Tozen Industrial and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of TOZEN / Tozen Industrial and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.