Mechanical Seal TRHD

Mechanical Seals API 682 4° Edition





Dual cartridge seal in face-to-back version with metal bellows designed in compliance
with standard API 682 4th edition CAT 2 and 3. All the construction elements
and materials of the seal are capable of working at very high temperatures. The
dual reverse pressure allows it to operate with auxiliary pressurised liquid (TRHD)
guaranteeing zero emissions into the atmosphere or non-pressurised (TRHT). Solution
also available with special materials resistant to chemically aggressive fluids.

20 – 110 (mm)0 – 23 (m/sec)0 – 40 (bar g)– 80 – 400 (°C)
(*) for measurements in inches, please contact our technical sales office.

• Standard solution resulting from tested designs and made in compliance with
standard API 682 4th edition
• The balanced dual cartridge solution is ideal for arrangement 2 and 3 or with
auxiliary fluid at atmospheric pressure (buffer) TRHT or pressurised (barrier) TRHD
• Metal rotary bellows
• Dual direction of rotation
• Uniform distribution system of multipoint injection flushing on the product side seal
• The bellows solution with secondary gaskets in graphoil is recommended with liquids
at temperature > 176 °C where emissions into the atmosphere must be controlled or
where “Zero emission” is required
• Efficient circulation device of the auxiliary liquid
• Connections for flushing or vent and IN-OUT for auxiliary liquid
• Possibility of sizing the shaft flange and sleeve according to customer request
• Recommended for API horizontal and vertical pumps


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