Forged Steel Bellows Seal Gate Valve

800LB
1/2″~2″ (15~50mm)
A105N,F304/F316,A350

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Bellows Seal · Forged Steel · Zero Stem Leakage

Forged Steel Bellows Seal Gate Valves for Critical High-Temperature Service

800LB, sizes 1/2″ to 2″ (DN15~50mm), available in A105N, A182 F304/L, F316/L, and A350 LF2 — rated for over 10,000 cycles without failure.

Overview

Forged steel bellows seal gate valve can solve the most frequent and serious problems that valve faces with is stem gland packing leakage, which results in wasted and increased downtime for the factory. Apart from the high cost of energy losses, gland leakages can also cause serious environmental, ecological and health hazards to factory workers. The leakage of sensitive materials can also constitute to the fire hazard, explosion, or damage to equipment by corrosive materials. If the leaked air enters into the pipeline, it could produce inflammable explosive or poisonous mixtures. Gland packed valve often requires continual maintenance in accessibility creating particular difficulties. Flowspec Luokai manufactures the forged steel bellows seal gate valve applicable to working conditions of high temperatures, withstanding over 10,000 cycles without failure. For getting best prices, just feel free to contact us now.

Gate valves are available in three bonnet designs. The first design is the Bolted Bonnet, with male-female joint, spiral wound gasket, made in F304L/graphite. Ring joint gasket are also available on request. The second design is the welded bonnet, with a threaded and seal welded joint. On request a full penetration strength welded joint is available. The third design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint.

1. Features

  • Bellows seal element: the key part is the bellow, which is roll welded with stem assembly on the bottom, and is roll welded with connecting cover on the top, forming a metal barrier between the mediums and atmosphere, and ensuring there is no leakage from the stem packing.
  • Tapered design valve disc: valve sealing seat and mediums are designed to streamline, the disc can remove the impurity with better sealing and long service life.
  • Double seal design (bellows + packing): if bellows seal is failed, the stem packing can take sealing effects, preventing of stem leakage.
  • Patented central location design: prevent the stem from being with tremble or noise, making the bellows has stable performance and long service life.
  • Compound valve casting technology: sand is mixed with binder and other additives, which make the rough casting is with fewer defects, such like pore, trachoma or cracks, but better tensile strength.

2. Technical Specifications

  • 800LB
  • Size: 1/2″ ~ 2″ (DN15~50mm)
  • Materials: A105 N, A182 F304/L, A182 F316/L, A350 LF2
  • Applicable medium: water, hot oil, gas, steam
  • Applicable temperature: -29℃ ~ +425℃

3. Standards

  • Design & manufacturing: API602, ISO15761
  • Face to face: manufacturer’s standard
  • Socket welded ends: ASME B16.11
  • Inspection & testing: API598

4. Applications

  • Petroleum
  • Chemical industry
  • Pharmacy
  • Chemical Fertilizer
  • Power Plant
  • Textile
  • Printing & dyeing

Forged Steel Bellows Gate Valve
Front View
Forged Steel Bellows Gate Valve
Cutaway
Forged Steel Bellows Gate Valve
Bellows Detail
Forged Steel Bellows Gate Valve
Parts Structure
Forged Steel Bellows Gate Valve
Dimensions

Parts and Materials

No. Part A105/F6a LF2/304 F11/F6aHF F304(L) F316(L) F51
1 Body A105 LF2 F11 F304(L) F316(L) F51
2 Seat 410 304 410HF 304(L) 316(L) F51
3 Wedge F6a F304 F6aHF F304(L) F316(L) F51
4 Stem 410 410 304 410 304(L) 304+
5 Gasket 304+Flexible Graphite / 316+Flexible Graphite / F51+Flexible Graphite
6 Bonnet A105 LF2 F11 F304(L) F316(L) F51
7 Bolt B7 L7 B16 B8(M) B8(M) B8M
8 Pin 410 410 410 304 304 304
9 Gland 410 304 410 304 316 F51
10 Gland eyebolt B7 L7 B16 B8(M) B8(M) B8M
11 Gland flange A105 LF2 F11 F304 F304 F304
12 Hex nut 2H 2H 2H 8(M) 8(M) 8M
13 Stem nut 410
14 Locking nut 35
15 Nameplate AL
16 Handwheel A197
17 Lubricating gasket 410
18 Packing Graphite

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