Mature technology for a broad range of applications

Our tight shut-off valve MAK is a universally utilisable product with triple-eccentric valve technology, suitable for extreme operating conditions and a high number of actuations. This type of valve has been successfully used since the 70s and is the further developed version of the original Adams patent.

Our MAK valves are so outstanding due to their high degree of reliability. This type of valve has proven its worth in a wide range of applications over decades. This not only means that we have been using the tight shut-off valve MAK with great success worldwide for almost 40 years, it also means that quite a number of customers are using valves we supplied decades ago, which are still in good working order in their plants. That is reliability.

One-hundred-percent tightness

We have remained true to the basic principle of the triple-eccentric design, which enables the valve to close one-hundred-per-cent tight. Despite this, we have continued enhancing details of this design over the years. For example, the MAK is equipped with a seal in the valve body. This protects the seal from the flowing medium, making maintenance intervals longer and increasing its service life. The special design of the seal enables the valve to be opened and closed without friction, even when working under great differences in temperature and full nominal pressure.

The MAK can be used for a broad range of temperatures and pressures. The MAK has proven to be highly efficient under conditions such as:

• Steam
• High temperature
• Low temperature
• High medium flow speeds
• High pressures
• Aggressive media
• Abrasive media


  • Tightness on both sides
  • Low-friction function
  • High resilience to temperatures
  • Fireproof design
  • Low actuation torques
  • Excellent control characteristics
  • Minimal pressure losses
  • Compact, robust design
  • Simple to maintain, even on site /replaceable interior parts
  • Optional installation length
  • Protection against emission
  • “TA Luft” specification
Tight shut-off valve MAK blocking


We offer a blocking system as an additional safety feature for maintenance work. This guarantees the safe closing of the valve even in the highly unlikely event of a shaft breaking. This is demanded in many cases by safety authorities.

Low-temperature applications

We have been successfully manufacturing valves for use at low temperatures since the 80s. The combination of selected materials, innovative engineering and high-quality manufacturing result in functional reliability even at a temperature of –196 °C and high pressure demands. With the help of our in-house testing facilities for low-temperature applications we continually develop our products to meet specialised customer requirements. This strategy enables us to react quickly and reliably to the individual wishes of our customers.

We use the following materials for low-temperature applications: CF8M, CF3M, CF8, CF3.


Depending on the type of application, various types of packing ensure optimum tightness for the requirements of the shaft system. For our customers we implement emission-proof packing with “TA Luft” specification.

Tight shut-off valve MAK packing
Tight shut-off valve MAK sealing

Sealing Systems

The sealing system integrated in the contour of the body was developed by Adams and is available with a metal-graphite laminated seal, a solid metallic seal, an L2 metal seal or a rubber seal. The advantages of these sealing systems are extremely reliable tightness, even in critical areas of application.


ADAMS Product range
MAK brochure
LNG brochure
Hydrogen brochure
ADAMS Stock valves brochure
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