Ball valves for district Energy and steam

Performance from Start to Finish

District heating is the use of thermal energy, in the form of steam or hot water for the heating of living spaces and business premises. The heat energy is usually produced as a by-product of power generation in power plants (combined heat and power, CHP) or, for example, in waste incineration.

The heat output is usually converted to hot water or steam. The transport and distribution takes place with the aid of piping systems, collection stations and transfer stations. To minimize pressure losses, valves must have extremely low resistance values. To reduce operating and maintenance costs, life cycles of more than 30 years in district heating are standard.

As a system supplier for district heating ball valves, Böhmer is a strong and experienced partner of the industry. Fully welded ball valves from Böhmer impress with their low resistance values ​​and extremely long service lives. They are used on the complete route from the producer to the handover to the consumer.

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BÖHMER ball valves can be used in all areas of district heating, for example in:

  • Power plants
  • Onground and underground pipelines
  • Pressure regulating stations
  • Distribution stations
  • Special applications

In addition, we offer our ball valves with a variety of material and equipment variants.

Due to our manufacturing competence and the experience of the specialists in sales, technology and assembly, we are able to adapt our ball valves perfectly to your individual application needs.


of our Ball Valves for district heating and steam


The high technical know-how and precise production with high-quality materials ensure a long service life of our ball valves


Due to their well-thought-out design and the use of special material combinations, Böhmer ball valves do not need to be lubricated.


We offer a comprehensive delivery program for optimal purchasing conditions and sustainable solutions “from a single source”.

Convincing arguments

We know that our products deliver what they promise.
To give you an idea of the numerous advantages of our ball valves, we have compiled the following list of some of the special features.











Since a district heating ball valve is part of a pipeline, BÖHMER uses solid forged steel for the body parts. We furthermore ensure that the wall thicknesses are greater than those of the connecting pipeline.

Large tensile and pressure loads as well as bending moments can thus be compensated without any risk of malfunctions of BÖHMER district heating ball valves. The body components of BÖHMER district heating ball valves not only surpass the relevant standards. They also ensure the highest level of operational safety even under extreme working conditions.

No cold forming method is used in the production of body parts for BÖHMER district heating ball valves. The physical and chemical properties certifi ed in the material certifi cates thus remain unchanged.

The solid body components ensure the highest level of operational safety even under extreme conditions.

Solid body components

District heating ball valves are sometimes subjected to tremendous loads. The design must therefore ensure prevention of stress corrosion cracking.

In order to make sure that no corrosive matter can enter the weld seams, all BÖHMER district heating ball valves are fully-welded with full-penetration weld seams. The full-penetration weld seams are flawlessly welded without any cracks or lack of fusion.

By fulfilling the requirements of the relevant process approvals for manufacturing pipelines and pressure vessels, the weld seams meet the most demanding quality standards. Uninterrupted operational reliability of district heating ball valves is given top priority at BÖHMER.

The full penetration of the weld seams enables our ball valves to withstand even extreme stresses, thus ensuring safe operation of the valves.

Fully welded

In order to manufacture Böhmer district heating ball valves for underground installation with end-to-end dimensions that make them suitable for insulation, the valve body is extended by pipe ends. These pipe ends surpass the requirements of EN 488 in respect to wall thickness. This ensures that collaring for vent and drain pipes is possible, without risk of falling short of the minimum wall thickness required by the standard. Furthermore, due to their absolute roundness, the machined pipe ends minimize the aligning necessary for welding the ball valves into the pipeline.

The elongated weld ends fulfil more than the required standard, while machining operations ensure absolute roundness of the weld ends.

Wall thicknesses above standard

The spring-loaded ball seals ensure a long service life and are indispensable for the double block and bleed function, which is mandatory for certain operating conditions.

We use cylinder spring packs which, in comparison to disc springs, have longer spring travel and extended service life.

Thanks to the piston effect and the long spring travel, the self-adjusting sealing system can compensate for potential wear on the gaskets, even with dirt in the medium. The entire sealing system is totally enclosed in the body and thus protected from dirt, so that functionality is guaranteed for a long time.

The spring-loaded ball seals ensure longer service life and constitute the basis for fulfi lling double block and bleed requirements.

Spring-supported seat rings

Starting from DN65 / PN40 and DN125 / PN16, the use of trunnion-mounted balls is standard in BÖHMER district heating ball valves.

Trunnion mounting of the ball extends the service life of the ball valve by reducing the forces acting on the sealing elements.

In addition, the low physical load on the ball valve parts ensures significantly lower operating forces. The gear boxes and actuators can thus be designed more cost-effectively and with a more compact design.

The trunnion-mounted ball increases the service life of the valve by reducing stresses.

Trunnion mounted ball

The solid ball ensures highest operational safety and a minimum loss of flow. The solid design with a round and straight bore prevents loss of pressure and, hence, of effi ciency. The higher cost of the ball valve thus quickly pays off. Hollow balls are less expensive to manufacture because they require less material, but they are generally suitable only when pressure and efficiency loss are not taken into consideration in design calculation. For district heating, BÖHMER always recommends the use of ball valves with solid balls.

The solid ball ensures top operational safety without flow losses

Solid ball

The separation of the stem extension from the medium in BÖHMER ball valves for underground installation reduces the thermal stresses on the insulation of the bonnet and stem extension. This helps prevent water from penetrating the insulation.

The top of the stem extension is made of stainless steel and is therefore resistant to ambient foreign corrosive substances.

The separation of the bonnet reduces the thermal stress on the insulation.

Separated bonnet

In order to ensure consistently exact end positions of its ball valves, BÖHMER equips its district heating ball valves with enclosed limit stops.

These limit stops are well protected from any dirt and damage. In contrast to open limit stops, enclosed limit stops are not exposed to dirt. They thus ensure reliable positioning of the valve in the end positions. The enclosed limit stops ensure that the ball is always moved into a consistently exact end position.

This prevents damage that can otherwise be caused by water flowing though an improperly positioned ball.

The enclosed limit stop is not exposed to dirt and thus ensures exact positioning of the valve in its end positions.

Enclosed limit stop

Both the two-flat header on the stem extension and the groove in the square key ensure clear position indication, even for valves installed>
The stem top end, with its flow indicator on the top face, is designed as a square. This square stem end has a groove on the side which ensures correct mounting of an additional stem extension or a square key. The two-flat header on the stem extension indicates the direction of the pipeline.

The combination of these two indicators ensures permanent visibility of the ball position inside the valve, even when the valve body and the direction of the pipeline are no longer visible.

The BÖHMER position indicator is designed with a two-flat header and a red-colored direction notch showing the exact position of the ball even after assembly of BÖHMER accessories.

Doubt-free position Indicator

For stem sealing, BÖHMER uses a redundant system.

The first stem seal is located just above the ball. It stops hot water from entering the stem extension and thus prevents unnecessary loss of heat and thermal damage to the insulation. The lower sealing system is based on 2 pressure- and heat-resistant o-rings. The upper sealing system is replaceable and is based on one o-ring and one PTFE-sealing ring.

Furthermore, the second sealing system is used to hold the stem extension in place.

The redundant seals of the stem ensure absolutely hermetic seal-off from the environment.

Redundant steam sealings