Catalog
Industrial valves
Industrial valves
Butterfly valves
Butterfly valves
PTFE-lined butterfly valves of PA 200 series
Butterfly valves of PA 300 series
Butterfly valves with double offset of PA 400 series
Butterfly valves of PA 600 series
Butterfly valves with double offset of PA 700 series
Butterfly valves with tripple offset of PA 900 series
Gate valves
Gate valves
Knife gate valves with through knife of PA 510 series
Bidirectional knife gate valves of PA 520 series
Bidirectional knife gate valves with demountable body of PA 530 series
Unidirectional knife gate valves of PA 540 series
Bidirectional knife gate valves with internal rubber inserts of PA 550 series
Bidirectional knife gate valves with polyurethane seat of PA 560 series
Unidirectional knife gate valves for high pressure with blind body of PA 570 series
Pinch valves produced by PromArm
Gate valves 30с41нж of Promarm manufacturing
Other gate valves
Valves
Valves
Stop valves
Isolation valves
Safety valves
Diverter valves
Control valves
Mixing valves
Solenoid valves
Ball Valves
Check Valves
Screen filters
Electrically Actuated Industrial Valves
Electrically Actuated Industrial Valves
Electrically actuated gate valves
Electrically actuated butterfly valves
Electrically actuated ball valves
Electrically actuated ball valves
Power Industry Valves
Other industrial valves
Other industrial valves
Steam traps
Pressure and level regulators
Tempering valves
X-mas tree valves and wellhead equipment
Pinch valves
Electric actuators
Electric actuators
Multiturn electric actuators for gate valves
Rotary electric actuators for butterfly valves and ball valves
Linear electric actuators for valves
Pipefittings
Pipefittings
Pipe elbows
Reducers
Tees
Pipe blinds
Pipe caps
Fasteners
Sealing materials
Flanges
Inquiry form

Pipe elements

Fasteners. Image

The accuracy and strength of any joint depend on the material the fasteners are constructed of.

There are many types of fasteners, including bolts, studs, nuts made of different grades of steel distinguished by their strength characteristics, and their resistance to aggressive media, temperature effects, and other corrosive effects.

In order to choose the steel grade of the fasteners used for flanged joints one should refer to the industrial standards the flanges conform to.

Material requirements, test types, applicability of the fasteners, their functions, and operating conditions must conform to the requirements of the respective regulatory documents for industrial safety.

When choosing the material of the fasteners, the linear expansion coefficient of the material of the flanges must be taken into account. The difference between the expansion coefficient of the fasteners and the flanges must not exceed 10%.

A larger difference between expansion coefficients of the two materials is acceptable only in the following cases:

  • material selection is based on strength calculation or experimental research;
  • design temperature for flanged joints is below 100ºC.

Fasteners. Image

Studs are constructed in accordance with GOST 9066-75 and Industrial Standard 26-2040-96.

Nuts are constructed in accordance with GOST 9064-75 and Industrial Standard 26-2041-96.

Nuts. ImageStuds. Image

PromArm supplies special steel fasteners for flanges.


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