Overview of Expansion Bellows

ZHW expansion bellows have been designed to control vibration, reduce noise, relieve stress, prevent system shock and compensate for misalignment and movement. Use of braided metal connectors for applications such as pumps, compressors, and other mechanical equipment will enhance the overall operation of the system.

Flexible metal hose by itself, when subjected to high pressure can over-extend past the ability to operate properly. It is necessary, therefore, to include an external flexible restraint (i.e., braid) to withstand the specified internal pressure and prevent excessive elongation. Braid, (woven metal) is designed to fit snugly over metal hose and is fastened to the ends of both hose and fittings. This braid is designed to be strong enough to withstand elongation for the full pressure rating of the hose.

Flexible metal hose and braid can be made from a variety of different metals to meet industry needs. Specification of the hose and braid is determined by temperature, pressure, flow media, application and external environment. Common materials used for braided flexible metal connectors are 321 stainless steel hose and a 304 stainless steel braid and are carried in stock by ZHW products. The products contained in this catalog are representative of the typical sizes, lengths and materials found for pump connectors; however, other materials and lengths are available and can be ordered per customer specification.

Description

ZHW’s expansion bellows Series EBF521 are specifically designed for piping applications requiring limited absorbtion of axial and lateral movements. Where small thermal movements are involved and proper anchoring and guiding is feasible, ZHW’s Single-Flex “EBF” series expansion joint system provides the most economical installation. Single-Flex is the base member of ZHW metal expansion bellows family, consisting of a bellows element and end fittings.

  • Absorbs and isolates troublesome pipeline vibrations
  • Smooths out force-pump system pulsations
  • Tranquillize jittering compressor pipelines
  • Also absorbs pipeline expansion, compensates for misalignment, eliminates piping stresses.
  • Ends costly failure and downtime caused by pipeline vibration transmissions
  • Customized to solve your vibration problem

For more information about the features and benefits of the ZHW expansion bellows series EBF521, Download our brochure.

For up-to-date pricing and availability information. Contact ZHW today.

Specification of expansion bellows series EBF521
Diameter
DN		 Total length Bellows specification Axial movement Weight
Eff length OD Eff Area Spring rate Extension Compression
mm mm Lb(mm) ΦD(mm) cm2 kg/mm ΔXe(mm) ΔXc(mm) kg/pc
32 200 88 59.2 20.3 19.7 5 30 4.9
40 250 96 65.7 25.4 20.3 5 30 5.4
50 300 120 81.2 38.7 25.0 5 35 6.5
65 300 120 97.2 58.4 30.8 5 35 8.8
80 300 120 113.7 79.6 26.0 10 40 11.3
100 300 132 139.7 126.1 29.6 10 45 14.6
125 300 144 165.7 183.1 32.6 10 46 19.9
150 350 165 196.7 255.9 37.5 10 50 27.6
200 350 180 247.7 420.9 43.8 10 55 37.6
250 350 200 305.7 643.6 57.0 10 60 55.7
300 350 200 355.5 887.1 66.2 10 60 68.1
350 400 200 399.0 1119.7 61.8 10 65 90.7
400 400 210 458.7 1464.9 93.6 10 65 135.3
450 400 210 500.0 1720.2 90.1 10 70 164.7
500 400 210 551.0 2115.6 99.3 10 70 192.2
550 400 210 602.0 2551.8 109.1 10 70 223.1
600 400 210 653.0 3028.8 119.0 10 70 244.4
Note: Standard ZHW Type EBF521 expansion bellows shown in the table are considered Standards and if any different technical requirements please contact ZhongHaiWei.
For more accurate quotation please provide as following information:
Size & Over Length ___________________________________
Temperature ___________________________________
Application ___________________________________
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