RTV Bellows sealed globe valve introduced advanced foreign technology, using double bellows design, welded to the valve stem to maintain stable operating performance, avoid the valve vibration caused by valve plug vibration. At high temperature, the stem does not touch the medium to ensure zero leakage of the stem. At the same time ensure enough strength and toughness, can switch tens of thousands of times. The handwheel is ergonomically designed, with longer service life and easy and convenient operation. The opening and closing of the bellows cut-off valve is a plug shaped valve. The seal face is flat or cone, and the valve is moving straight along the center line of the fluid. It is the most widely used valve. It is popular because of the small friction between the sealing surfaces in the process of opening and closing, which is relatively durable, the opening height is small, the manufacturing is easy, and the dimension is easy to make. It is convenient not only for medium and low voltage but also for high voltage. Widely used in food, medicine, petroleum, chemical industry, natural gas, iron and steel, environmental protection, papermaking and other transportation pipelines to cut off or circulate medium.
Size range : DN15-DN500
Pressure : PN16-PN40
Temperature : ≤425℃
Materials:GS-C25(1.0619/WCB),1.4308(CF8), 1.4408(CF8M),SS321,904L etc.
Materials of bellows: SS304, SS316, SS316L,SS321,SS316Ti ,Hastelly C276
Application：Hot oil system, steam system, molten sale and hot and cold water system etc.
Features of bellows seal valves:
- Double wall bellows seal as standard.
●Plug with marginal seat
●Bellows seal welded to cover
●Welded seat
● Bellows seal 10,000 load cycles
● External stem thread
●Secondary sealing: graphite bellows sealing
Technical specification
Design standard: DIN 3356
Face to face dimension: DIN 3202
Flange ends: DIN 2543-2545
Test & inspection: DIN 3230
Advantage：
1.Bellow seal element. The key part of bellow sealed globe valves is metal bellow. It is the connection between cover and stem with automatic roll welding. The metal bellow can keep the stem part no leakage.
2.Benefit from the con and streamline shape design, the disc has a reliable seal and longer service life.
3.Double seal design(bellows packing). Bellow and packing can protect against leakage and provide a excellent seal.
4.Grease nipple. It can direct lubricate the stem, nut and sleeve.
5.Ergonomic hand wheel. It provide longer service life and easier operation.
