The Holz 320 Expansion Joint applies the technology of the tire industry to the hand built pressure piping expansion joint.  The use of polyester tire cord and the modified arch construction provides greater overall performance than previous designs.
The superior performance offered by the 320 Expansion Joint is the result of a three-year development program that thoroughly re-engineered the handbuilt expansion joint. This program studied the relationship between the pressure capability of the expansion joint and the media temperature.  Holz Rubber engineers also studied concurrent movements and spring rates.  As a result, Holz can now provide expansion joint application guidelines which were previously unknown in the industry.
The superior performance of the Series 320 Expansion Joint is the result of 3 years of development.
BENEFITS
• Greater Strength
• Greater Flexibility
• Longer Life Expectancy
• Increased Safety
• Lower Project Costs
• Engineered for
• Performance
• Greater Movement
• Lower Spring Rate
• Higher Pressure
• Capabilities
• Lighter Weight
• Conforms to USCG and MIL
• Spec Requirements

REINFORCEMENT
The 320 Expansion Joint incorporates woven polyester fabric and polyester tire cord in a fabric matrix bonded within the elastomeric tube and cover.  The inherent strength of polyester tire cord allows the 320 Holz Expansion Joint to provide greater strength and higher pressure capabilities.

Holz engineers were the first to define the relationship between temperature and pressure as it applies to hand built, fabric reinforced, rubber expansion joints.  By defining the exact relationship, Holz, with the 320 Expansion Joint, provides more precise guidelines for pressure/vacuum capability at various temperatures.

GREATER MOVEMENT

The unique arch design of the 320 Expansion Joint provides greater movement capabilities than the traditional hand built product; without increasing the face-to- face requirements.  Simply stated, the single arch 320 can provide movement capability equal to the traditional double arch product and the double arch 320 movement capabilities are equal to those of the standard quadruple arch product.  The Holz Rubber 320 Expansion Joint can solve piping movement problems without having to resort to long and expensive multi-arch products.  These movements are unmatched in the industry and enable Holz to provide an expansion joint that will satisfy a wide range of needs.

LOWER FLANGE FORCES
The unique arch design of the 320 Expansion Joint combined with a modified radial tire cord construction throughout the arch wall profile, results in lower flange forces.  Lower forces mean less stress on the piping system components.
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Series 300 | Series 320 | Series 320EZ | Series 320M | Series 530 | Series 980 | SF1000 | VD1000 | Duct Joints