3/4″-800LB-SW Bellows Seal Gate Valve

Technical Data Sheet

Product: Bellows Seal Gate Valve
Model / Size: 3/4″ – 800LB – SW

1. Product Description

This valve adopts a bellows seal design, which fundamentally eliminates stem packing leakage commonly found in conventional gate valves. The bellows assembly, combined with the stem, forms a static seal. An additional packing box serves as a secondary backup seal, achieving a “zero leakage” stem sealing performance. It is suitable for severe service conditions including high temperature, high pressure, high vacuum, and toxic, flammable, or corrosive media.

2. Basic Parameters

3. Piawaian Reka Bentuk

4. Bill of Materials (Typical Configuration)

5. Dimensions & Weight (Reference)

6. Operating Conditions

7. Testing & Inspection

• Shell Strength Test: 1.5 times rated pressure, no leakage.
• High-Pressure Seat Test: 1.1 times rated pressure.
• Low-Pressure Pneumatic Test: 0.6 MPa compressed air.
• Bellows Leak Test: Helium mass spectrometry, leakage rate < 1×10⁻⁶ Pa·m³/s (or meeting Class V sealing requirement).
• Operational Test: Valve cycled fully open/close under rated differential pressure.

8. Features & Benefits

1. Zero Leakage Assurance: The bellows isolates the stem from the atmosphere, eliminating external stem leakage – ideal for stringent environmental applications.
2. Long Service Life: High-cycle-life bellows design ensures reliability under frequent operation.
3. Low Maintenance: Dual stem sealing (bellows + packing) provides a secondary seal in the event of bellows failure, ensuring system safety.
4. High Temperature & Pressure Capability: Class 800 rating with socket weld ends is suitable for high-pressure steam and thermal oil systems.

Notes:

1. Dimensions and weights are typical values based on API 602; actual values may vary slightly depending on manufacturer design (e.g., handwheel size, bonnet height).
2. For NACE MR0175 (sour service) compliance, please specify when ordering.
3. During installation, follow the approved Welding Procedure Specification (WPS) for socket weld connections to avoid welding stress that could affect bellows life.

JAMINAN:

SAVVY VALVES komited untuk menyampaikan kualiti produk yang luar biasa dan perkhidmatan selepas jualan tanpa bimbang. Injap kami dijamin memberikan hayat perkhidmatan minimum selama 12 bulan, di mana kami akan membekalkan semua alat ganti yang diperlukan dan arahan penyelenggaraan terperinci secara percuma. Dalam tempoh jaminan, jika sebarang kerosakan bukan disebabkan oleh manusia berlaku, kami akan menggantikan komponen tanpa kos dan menyediakan sokongan teknikal profesional. Selepas jaminan tamat, pelanggan hanya perlu membayar kos alat ganti, sementara masih mendapat manfaat daripada perkhidmatan penyelenggaraan berdiskaun. Matlamat kami adalah untuk membantu pelanggan mengurangkan kos operasi dan meningkatkan kecekapan pengeluaran melalui kualiti yang boleh dipercayai dan sokongan selepas jualan yang komprehensif. Sama ada untuk pertanyaan teknikal atau keperluan penyelenggaraan, pasukan pakar kami akan bertindak balas dengan segera untuk memastikan sistem injap anda mengekalkan prestasi optimum pada setiap masa.