Graphite Packing Set for Gate Valve, ISO 15848-1, 28 * 40 mm

Product Name: Low Emission Graphite Packing Set for Gate Valves
Model: M600
Size: 28 mm (ID) * 40 mm (OD) * 5 Rings
Material Properties:
Graphite Purity: ≥99 %
Metal Wire Content: 20 % (Inconel 600)
Sulfur Content: ≤50 PPM
Chlorine Content: ≤20 PPM
Certifications: ISO 15848-1, TA-Luft, API 622 (fire-safe to 400°C)
Operating Conditions: –45°C to +425°C

Design Philosophy

Standard Flat-End (Plain) Composite Design
Although visually simple, flat-end packing demands the highest manufacturing precision.
A single graphite ring can create multiple sealing lines, whereas a V-ring only forms one, giving flat-end rings superior long-term stability.

Construction

Upper & Lower Braided End Rings: High density (2.5–2.6 g/cm³) for rapid bolt-load transfer.
Centre Pure-Graphite Rings: Immediately deform to create the primary seal.
Sequential Deformation: Once centre rings reach ≥1.6 g/cm³ density, end rings deform to complete the seal—proven reliable in extensive tests and field service.

Key Benefits

Stable, multi-line sealing under extreme temperature cycles.
Lower gland bolt torque requirement reduces stem binding.
Full compliance with international low-emission standards.

Low Emission Standards

1. ISO 15848

ISO 15848 standardizes the measurement, testing, and evaluation procedures for industrial valve fugitive emissions. This standard is divided into two parts. ISO 15848-1 defines the test procedures for valve type testing, and ISO 15848-2 specifies the requirements for the manufacturing of valve products.

2. TA- LUFT (VDI 2440)

The German fugitive emission control law TA-LUFT VDI2440 defines the leakage rate, testing, and testing methods.

3. VDI2200, VDI2440 and TA- LUFT Flange Connection

According to TA-LUFT and VDI 2440, the flange connection must meet the test pressure of 1 bar under the condition that the leakage rate is less than 10−4 mbar × l/(s × m). VDI 2200 specifies the selection, calculation, design, installation, and testing process of the flange connection. It also allows reference to VDI 2440 for the leakage rate. VDI 2200 also stipulates the burst pressure test to avoid the risk of flange breakage and sudden leakage.

4. CLEAN AIR ACT

The Clean Air Act stipulates that the maximum allowable leakage rate for valves, pumps, and agitators in the United States must comply with the EPA Method21 (blower method) for leakage testing, and the testing method must be consistent.

5. API 622

API 622 is the second edition of the international performance test for disk root materials, which includes temperature, pressure, thermal cycles, and mechanical cycles. API 622 specifies 1510 mechanical cycles and 5 thermal cycles, from room temperature to 260°C (500°F), pressure from 0 to 600 psi (0-41bar), for high-temperature testing. Under carbon equivalent testing, the allowable leakage rate is 100 ppm.

6. API 624

The first edition of the API 624 standard for the type test of the fugitive emission of the valve with a graphite seal includes the up and down motion and rotation of the valve, with a maximum diameter of 24 inches. The test requires the temperature to rise to 260°C (500°F) and perform 310 mechanical cycles and 3 thermal cycles, with the maximum allowable leakage rate being 100 ppm. The valve to be tested must first be tested according to API 622, and the temperature range is from -29°C to 538°C (-20°F to 1000°F).

ISO 15848 Sealing Grades

VDI2440 Specifies the Maximum Leakage Rate of Valves with Harmful and Combustible Substances