+86-17306773316      luomaivalve@gmail.com
English
What Is Bellows Valve
Heat Transfer media: hot oil is commonly used in industries such as synthetic fibres / POY (Partially Oriented Yarn). However, there is always a risk of fire due to hot oil spillage on highly inflammable chemicals. Here, bellow Valves.bellows sale globe valve, stainless steel bellow valve, bellows sale gate valve, T type bellow valve, Y type bellow valve, din bellows gate valve can stop the leakage. Vacuum / ultra high vacuum: some applications require a vacuum pump to continually extract air from a pipeline. Any conventional Valves installed on the pipeline can allow external air to enter the pipeline thorough the Valve stuffing box. Hence the bellow seal Valve is the only solution to prevent air from passing through the stuffing box.

Highly hazardous fluids: for media such as chlorine, hydrogen, ammonia and phosgene, the bellow seal Valve is an ideal design as leakage through the gland is totally eliminated. Nuclear plant, heavy water plant: in instances where radiation leakage is to be prevented at all times, the bellow seal Valve is the ultimate choice. Costly fluids: in some applications leaks need to be avoided simply because of the high cost of the fluid. Here, an economic assessment often favours the use of bellow Valves.bellows sale globe valve, stainless steel bellow valve, bellows sale gate valve, T type bellow valve, Y type bellow valve, din bellows gate valve. Environmental standards: around the world, standards regarding emissions and the environment are getting more stringent day by day. It can therefore be difficult for companies to expand within existing premises. With the use of bellow seal Valves, expansion without additional environmental damage is possible.
What Is The Function Of The Bellows Valve
The bellow is a critical component and forms the heart of the bellow seal Valves. To avoid any twisting of the bellow the Valve must have a stem with linear movement only. This can be achieved using a so-called sleeve-nut at the Yoke portion of the Valve Bonnet. A hand wheel is fitted onto the sleeve-nut which effectively transfers a rotary motion of the hand wheel into a linear motion in the Valve stem.
There are two main types of bellow: the Forged Bellow and the Welded Bellow. Formed-type bellows are made from rolling a flat sheet (thin wall foil) into a tube which is then longitudinally fusion welded. This tube is subsequently mechanically or hydrostatically formed into a bellow with rounded and widely spaced folds. The welded leaf type bellow is made by welding washer-like plates of thin metal together at both the inner and outer circumference of the washers - like plates. A welded leaf bellow has more folds per unit length as compared to forged bellows. Thus, for the same stroke length, forged bellows are two to three times longer than their welded leaf counterparts.
Reportedly, mechanically forged bellows fail at random spots, while the welded leaf usually fails at or near a weld. To ensure full penetration of bellow ends and end coller welding it is advisable to fabricate using micro plasma welding.
 
SKW44SE-DN251
Y-Straine4-
IMG_3255
Y-Straine
Y-Straine4
IMG_3242
Types Of Bellows Valves
The bellow cartridge is welded to both the Valve Bonnet and the Valve stem. The bellow cartridge has a number of convolutions and these convolutions become compressed or expanded depending upon the movement of Valve stem. (Scientifically speaking the bellow gets compressed when the Valve is in the open position and expanded when the Valve is in the closed condition). It is important to properly install the Valve bodies. The bellow can be sealed to the Valves in two different ways.Firstly, the bellow can be welded to the Valve stem at the top and the Valve body on the bottom. In this case the process fluid is contained inside the bellow or in second method the bellow is welded to the Valve stem at the bottom and the body on the top.In this case the process fluid is contained in the annular region between the Valve Bonnet and bellow (from the outside).The multi-ply bellow design is preferred for handling higher pressure fluids (generally two or three plies of the metal wall).
A two ply bellow can increase its pressure rating by 80% to 100% as compared to a single ply bellow of the same thickness. Alternatively, if a single ply bellow of a thickness equivalent to a pressure rating of a two ply bellow is used, the stroke length is reduced. Thus, a multi-ply bellow design offers a distinct advantage over a single ply bellow. It is clear that the bellow is subject to metal fatigue and this fatigue can induce weld failure. The bellow fatigue life is affected by the material of construction, fabrication technique, stroke length and stroke frequency, in addition to the usual parameters such as fluid temperature and pressure. Bellow materials
The most popular stainless steel bellow material is AISI 316Ti which contain Titanium to withstand high temperatures. Alternatively, Inconel 600 or Inconel 625 improve fatigue strength and corrosion resistance as compared with stainless steel bellows. Similarly, Hastalloy C-276 offers greater corrosion resistance and fatigue strength than Inconel 625. Fatigue resistance can be improved by using a multiply bellows system and reducing the stroke length; this can significantly increase the bellow service life.
view more
Installation Video On Bellows Valve
 
How To Choose Bellows Valves
Advantages Of Our Bellows Valves
  • Reduced stroke length 
  • A distinct advantage
  • Withstand high temperatures
Brand Technology&Services
Luomai is fully covered by ISO9001 system and has approved by TS special equipment A-level certification, CE, API and TUV. The main product bellows valves and other sery products enjoy a high reputation, especially in the applications of heat transfer oil, steam, chlor-al kali, etc., and the popularity and reputation are widely recognized. Products are sold to more than 30 countries and regions in Europe, America, Asia, Africa, and the Middle East..The company has increased the introduction of intelligent equipment, and information application and digital management have become the goal of future factory construction. It has a valve CAD design center, a three-dimensional simulation manufacturing test design system and a new product development center. It has processing centers, intelligent special CNC machine tools, welding robots and other special processing equipment, and automatic inspection equipment developed in cooperation with Europe's leading intelligent inspection equipment company.


  • cer-3
  • cer-4
  • cer-2
  • cer-1
  • cer-2
  • cer-2
Related Products
Extended Stem Bellows Gate Valve
Extended Stem Bellows Gate Valve

API Cast Steel Bellows Gate Valve

Features and benefits
● Long cycle life bellows (2000 cycles) in Gr. 321 (stainless), Inconel for special applications, (may be replaced with Monel trim to resist corrosion or Hastelloy C for chlorine service).
● Improved body-bonnet joint: Graphite reinforced with SS foil gasket for Class 150 valves. Fully-encased, spiral wound graphite-filled Gr. 316 (stainless) gasket for Classes 300-600.
● Bolted body-bonnet for fast serviceability. Hermetically-sealed bonnets available for Classes 300 and 600.
● Two or three section bellows assembly.
● Non-rotating stemprevents torsion of bellows.
● Two secondary stem seals: a) Backseat in open position; b) Graphite packing.
● Welded-in seat hardfaced with CoCr alloy.
● Wedge hardfaced with CoCr alloy for long life.
● Seating faces hardfaced with CoCr alloy, ground and lapped.

0
0
Y Type Bellows Seal Globe Valve
Y Type Bellows Seal Globe Valve
Application
Hot oil system, steam system, hot and cold water system etc.
Advantage
1.Bellow seal element. The key part of bellow sealed globe valves is mental bellow. It is the connection between cover and stem with automatic roll welding. The mental bellow can keep the stem part no leakage.
2.Benefit from the cone 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.
0
0
API Standard Bellows Globe Valve
API Standard Bellows Globe Valve

API Cast Steel Bellows Seal Globe Valve

Design：ASME B16.34
Face to Face：ASME B16.10
Flange Ends：ASME B16.5

Test & Inspection：API 598

Application: Industry, Powerstations, Flue gas purification plant, processing technology, gas supply, vapour facilities, recycling facilities, vacuum facilities, hot water, heating technology, district heating, thermal oil applications, general plant manufacturing, etc. (other applications on request)

Medium : Steam, gases, hot water, thermal fluids, hot oil, process water, vacuum facilities, ammonia etc.(other flow media on request)

Materials : WCB, WC6,SS304,SS316

Bellows materials: SS304, SS316,SS316L,SS310, Hastelly C.

Size range : 3/4"-28"

0
0
Din Y Type Golbe Valve
Din Y Type Golbe Valve
Advantage
1.Bellow seal element. The key part of bellow sealed globe valves is mental bellow. It is the connection between cover and stem with automatic roll welding. The mental bellow can keep the stem part no leakage.
2.Benefit from the cone 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.
Technical specification
Design standard: DIN 3356
Face to face dimension: DIN 3202
Flanged ends: DIN 2543-2545
Test & inspection: DIN 3230
0
0
DIN Standard Lift Check Valve
DIN Standard Lift Check Valve

DIN Cast Steel Check Valve

The main features of our Check valves can be:

●Bolted bonnet

●Pressure seal bonnet

●Thread in or welded bonnet

●Cast or forged

●Swing check, piston check, ball check

●Welded in or replaceable seats

●Dual plate check valves

Materials : GG25(EN-GJL-250),GGG40,1.0619+N(GS-C25),1.4308(CF8), 1.4408(CF8M)

Size range : DN15-DN400

Pressure : PN16-PN40

Temperature : ≤425 ℃

Fig No. : DH44H

0
0
Angle Type Bellows Globe Valve
Angle Type Bellows Globe Valve
Application
Hot oil system, steam system, hot and cold water system etc.
Advantage
1.Bellow seal element. The key part of bellow sealed globe valves is mental bellow. It is the connection between cover and stem with automatic roll welding. The mental bellow can keep the stem part no leakage.
2.Benefit from the cone 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.
Technical specification
Design standard: DIN 3356
Face to face dimension: DIN 3202
Flanged ends: DIN 2543-2545
Test & inspection: DIN 3230
0
0
The company will continue to develop and lead the market in new products, seek diversified development paths, stabilize the domestic market, and actively develop international business.
 

Quick Links

Product Links

Subscribe

Sign up for our newsletter to receive more.
+86-17306773316
luomaivalve@gmail.com
Baihe Industrial Zone, Oubei Town, Yongjia County, Wenzhou City, Zhejiang Province
​Copyright 2021 Wenzhou Luomai ValveTechnology Co.Ltd. Sitemap. Supported by Leadong