Gasket material for Besa valve in Italy

Gasket material for Besa valve in Italy

BESA not only serves as a reference point for the production and development of its traditional products, but also for services (through its regular maintenance services) and marketing of new products that can meet a wider range of needs.We design and manufacture safety valves suitable for gas, steam, and liquid emissions.

The design, manufacturing, and selection of BESA safety valves comply with European directives 2014/68/EU (PED) and 2014/34/EU (ATEX), API standards 520 526 527, and regulations of RINA, Bureau Veritas, and Det Norske Veritas.

The scope of application of BESA safety valve is as follows:

Set pressure: from 0.2 bar to 600 bar;

Temperature: from-From 200 ° C to 750 ° C.

The building materials used for component standard production of Besa safety valves in Italy are as follows:

cast iron

carbon steel

low-alloy steel

Stainless steel (ferritic, martensitic, and austenitic)

For other structures, Besa typically uses thermoplastic materials (PFA, PVDF, ETFE, HALAR) and alloys such as chromium nickel iron alloy, Hastelloy alloy, Monel alloy, and duplex.

All materials used comply with current European (EN) and American (ASTM) standards

Regarding the size of safety valves, models with flange connections (EN or ANSI) range from dn15 (1/2 ") to dn250 (10");The types of threaded connections range from 1/4 "to 2" (cylindrical GAS or conical NPT).

According to the requirements, BESA provides assistance for the testing of major organizations (INAIL-RINA-GL-LR-TUEV-BV-DNV-AB, etc.) in its own office space.

Product series:

139 threaded connection safety valve

240F threaded connection safety valve

249 threaded connection safety valve

130 flange connected safety valve

240 flange connected safety valve

250 flange connected safety valve

260 flange connected safety valve

280 flange connected safety valve

290 flange connected safety valve

Gasket material for Besa valve in Italy

Gaskets are one of the key factors causing valve leakage .Therefore ，For different media ，Different working temperatures and variations Different gaskets should be selected for work pressure.

(1)Metal flat gasket The metal flat gasket adapts to the unevenness of the flange surface through its elasticity and plastic deformation .to prevent Plastic deformation of flange surface ，The yield strength of the gasket material must be significantly lower than the yield strength of the flange surface material .Metal flat gasket The materials usually include 08 steel ，Cathode copper The06Cr19Ni10 and 06Cr18Ni12Mo2.

In the sealing of steam medium ，With a vertex angle of 90 ° 、Depth is 0. 1mm Or the depth is 0. 01mm Spiral groove flange sealing cover ，Using metal flat gaskets for better sealing performance.

(2)Compressed asbestos fiber gasket The compressed asbestos fiber gasket combines the characteristics of rubber and asbestos .Rubber has the ability to The characteristic of easily accompanying unevenness on the flange surface ，But it cannot withstand high loads on plane strain ，NoHighly resistant temperature .In order to improve the load capacity and temperature resistance of rubber ，At the same time, it maintains its inherent characteristics to adapt to the table that matches it face ，Rubber reinforced with asbestos fibers ，Simultaneously adding to the materialInsert adhesive 、Filler and color .Some are still asbestos Add reinforced steel wire to the fiber gasket ，Intended to increase the strength of the gasket .Compressed asbestos fiber gasket is suitable for PN64 The following medium voltage valve ，The working temperature of the medium is generally within450℃ below.

(3)Spiral wound gasket Spiral wound gaskets are made by winding around the outer layer V Soft material group embedded between the metal strip and the stack become.The several turns at the beginning and end of the metal strip are welded firmly with spot welding ，To prevent the gasket from loosening.The metal strip gives the gasket a certain degree of elasticity ，with Compensate for minor deformations of the flange.And the embedded soft material enters the flange sealUsed as a sealing medium in the gaps of uneven surfaces.

The general manufacturer specifies the compression value for installing gaskets ，To ensure that the gasket can withstand appropriate stress and maintain the required elasticity .cushion The final working thickness of the piece is determined by the load capacity of the bolt 、Control the depth or inner and outer rings of the gasket groove installed in the flange .internal pressure Another function of the circle is to protect the gasket from being corroded by the medium ，The outer pressure ring should also keep the gasket in the bolt positionWithin the diameter.

The load-bearing capacity of the gasket is determined by the number of turns wrapped .Therefore ，Spiral wound gaskets can be customized according to the required pressure.