Ball valves & Flow control valves for Marine & Offshore

What are the benefits of MHA ZENTGRAF ball valves in the field of shipbuilding and offshore applications?

Conditions at sea are harsh. Waves metres high and extreme stresses put high demands on both man and machine. Our products withstand these stresses and ensure that, at least with regard to ball valves and valves, the people on site are not exposed to any risks.


Managing Director
Tel: +49 6861/7000-76

International Sales
Tel: +49 6861/7000-29

President & CEO MHA ZENTGRAF Corp.
Tel: +1 716 / 243-4734

Sales Director MHA China
Tel: +86 (0)21 5899 2090, ext.111

Business Development India
Tel: +91 8007999796

Firesafe ball valves

 MHA ZENTGRAF Firesafe ball valve

When handling flammable liquids, safety must be a prime consideration. Great importance is therefore attributed to the design of “fire-safe” shut-off valves utilized in many industrial environments including:

• chemical and petrochemical plants
• oil drilling and refineries
• on- /offshore installations

When fire does break out, it is important that it does not spread through failures in pipe-work systems. Even under the most extreme conditions shut-off valves must provide:

• secure operation
• reliable sealing in shut-off position
• reliable sealing to the outside

Due to their quarter turn shut-off design, MHA ball valves provide a solution to meet these demands. Metal seat edges at the ball seats guarantee the sealing function during and after contact with fire, even if the seals are burnt. In addition, both housings and shafts are sealed with heat resistant seats, ensuring their continued operation.

MHA ball valves of the BKH- and KH-series have been tested successfully according to firesafe standard ISO 10497. Currently MHA is certified for the BKH series with nominal sizes from DN 4 to DN 50 and the KH series with nominal sizes from DN 25 to DN 125, within a nominal pressure range up to PN 420 bar.

Double block and bleed ball valve

MHA ZENTGRAF Double block and bleed ball valve

Double shutoff for work in safety-relevant areas

  • Checking of shutoff device by bleed valve
  • Test connections for sensor monitoring

Available options

Double block (+bleed) (+bypass)


  • Space-saving
  • Fewer potential leakage points compared with a solution using pipes

Flangeable cylinder valves for e.g. riser tensioner system

MHA ZENTGRAF anflanschbarer Zylinder Kugelhahn für Riser-Tensioner System

  • Sizes from 5/8“ to 8“ (DN 15 to 200)
  • Pressure up to 10,000 psi (690 bar)
  • Steel, stainless steel or duplex
  • Bypass option

Highly corrosion-resistant bronze marine valve

MHA ZENTGRAF korrosionsresistener Kugelhahn aus Bronze für Marine und Offshore

  • All metal parts made of nickel-aluminum-bronze
  • 3“ (DN 80)
  • 700 psi (50 bar)
  • Flange connection EN 1092 (others on request)
Standard ball valves

As well as individual ball valves and valves, MHA ZENTGRAF has more than 30,000 ball valves and flow control valves in stock at any given time.

→ Ball valve program


E-mail: info@mha-zentgraf.com
Phone: + 49 6861/7000-0


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