1. Main Parameters and Characteristics

1.1

The main part 270.023-1 shall comply with the requirements of DSTU GOST 33724.1:2017, these Technical Specifications (TS), and the set of design documentation (DD) according to the specification.

1.2

For export deliveries, the product shall additionally comply with the conditions of the contract, international and national standards of the destination country, and with the legislation of Ukraine regarding product export.

1.3

The main overall and connecting dimensions shall comply with the drawings and technical documentation.

2. Functional Performance Indicators

2.1 Reliability Indicators

• Designed service life — not less than 20 years.

• Mean time between failures — not less than 120,000 braking cycles.

• Guaranteed failure-free operation — 12,000 braking cycles.

• Service life of seals, gaskets and packings — not less than 6 years.

Failure criteria:
– failure of components or assemblies;
– loss of tightness.

2.2 Limit State Criteria

– wear of working surfaces of the housing exceeding allowable limits specified in the DD;
– presence of cracks or chips on the housing affecting working surfaces;
– damage to flanges or mounting holes.

3. Design Requirements

The main part consists of: housing, covers, valve assemblies, springs, sealing elements, and standardized parts according to the DD.

The product shall remain operational at temperatures from –60 °C to +60 °C, with short-term operation possible at +80 °C.

The product shall be tight at a working pressure of 0.6 MPa.

Movement of working elements shall be smooth, without jerks.

4. Coating Requirements

Unmachined surfaces shall have a protective paint-and-lacquer coating that complies with the DD and applicable standards.

Springs and other elements shall have an anti-corrosion coating.

Surface preparation for painting shall be performed according to DSTU ISO 12944-4.

5. Material Requirements

The housing, covers, and main units shall be made of gray cast iron grades SCh150–SCh300 (DSTU 8833 or DSTU EN 1561).

Springs shall be manufactured from steel wire according to DSTU ISO 8458-2.

Sealing elements shall be made of oil-resistant rubber compound according to the DD.

All materials shall be accompanied by manufacturers’ quality certificates.

6. Completeness

– Main part 270.023-1 assembly;
– Passport for the batch of products (according to DSTU GOST 2.601);
– Operating manual.

7. Technological Requirements

The design shall ensure manufacturability, suitability for inspection, and maintainability.

The product shall be interchangeable with analogous products of other manufacturers.

8. Marking

The housing shall bear the following markings: manufacturer’s trademark, part number, model name, diameter, serial number, manufacturing date, and QCD (quality control department) stamp.

Marking shall be applied by stamping or casting.

9. Packaging Requirements

Packaging shall protect the product from moisture, dust, sunlight, and mechanical damage.

Unpainted surfaces shall be preserved (coated with protective lubricant).

Products shall be transported on pallets or in wooden crates according to applicable standards.

Each batch shall be accompanied by a passport and a set of documents placed in polyethylene protective packaging.