Ball valves
Two-piece ball valves
Two-piece threaded steel ball valves for reliable shut-off of liquid and gas flows in industrial, petrochemical and power generation systems.
Design
A simple and reliable engineering solution
The two-piece body provides a compact envelope, easy installation and stable tightness. The stem follows the anti-blow design principle.
Anti-blow stem
The stem is fitted from inside the body. This prevents it from being blown out by the working pressure, even under emergency operating conditions.
Two-piece body
The body and the connecting piece form a compact assembly for threaded installation in the pipeline.
Quarter-turn operation
A 90° turn of the handle opens or closes the flow quickly and gives a clear indication of the closure member position.
Materials
Designs matched to the process medium
The valves are made from carbon and stainless steels. The specific material is chosen according to the medium, temperature, pressure and corrosion resistance requirements.
- Carbon steel: W.Nr. 1.0619 and W.Nr. 1.1151.
- Stainless steel: W.Nr. 1.4581, 1.4571, 1.4552, 1.4541, 1.4408 and 1.4301.
- Other materials are available on technical request.
PTFE-based seat and stem seals.
For PN 100 and PN 160, reinforced solutions with metal-backed PTFE are used.
FPM O-rings depending on the selected design.
Technical parameters
Main specifications
Baseline data for preliminary selection. The final design is confirmed against the process medium, pressure, temperature and connection standard.
01
General parameters
- Design
- Two-piece ball valve
- Nominal size
- 3/8″–2″
- Nominal pressure
- PN 16, 25, 40, 63; PN 100 and PN 160 on request
- Pressure class
- Class 150, 300, 600, 800, 900 and 1500 on request
- Working temperature
- Up to 200 °C with standard PTFE seals
- Operation
- Manual lever handle, 90° turn
- Testing
- Hydraulic strength and leak tightness to EN 12266-1
02
Connections and materials
- Female G thread
- DLS-NG.Č and DLS-NG.K designs to EN 10266-1
- Metric thread
- DLS-NM.Č and DLS-NM.K designs on request
- Female NPT thread
- DLS-NNPT.Č and DLS-NNPT.K designs to ASME B1.20.1
- Body
- W.Nr. 1.0619 / 1.1151 or W.Nr. 1.4581 / 1.4571
- Ball
- W.Nr. 1.4057 or W.Nr. 1.4571
- Stem
- W.Nr. 1.4057 or W.Nr. 1.4571
- Seal rings
- Glass-fibre filled PTFE; other designs on request
Non-aggressive media
Water, process liquids, air and compatible gases.
Aggressive media
Used after verifying the compatibility of the materials and seals.
Industrial plants
Process lines, auxiliary systems and local assemblies.
Petrochemicals and power generation
Flow shut-off in systems with increased reliability requirements.
Operating range
Pressure and temperature
The permissible working pressure depends on the body material, the design class, the nominal size and the temperature resistance of the seals.
PN 16, 25, 40 and 63 are used in standard industrial systems within the permissible temperature range.
PN 100, PN 160 and Class 150–1500 designs are selected individually according to the body and seal materials and the size.
The maximum working temperature of the standard solution is limited by the resistance of the seal and is up to 200 °C.
The operating point must lie within the permissible area of the chart, allowing a margin for pressure and temperature.
Technical documentation
Design and dimension tables
Open the design you need. Each image can be enlarged to view part item numbers, materials and connection dimensions.
Design with a female pipe thread to EN 10266-1. Carbon steel and stainless steel versions are available.
Design with a female NPT thread to ASME B1.20.1 for projects that use the American pipe connection standard.
Design variants
Photo gallery
Two-piece ball valve versions with different body geometries and threaded connections.
Engineering support
We will select a valve to match your system parameters
Our specialists will help determine the size, pressure class, thread standard, body material and seals for the process medium.