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Ductile Iron Flexible Coupling

Ductile Iron Flexible Coupling

    Payment Type: L/C,T/T
    Terms of Trade: FOB,CFR,CIF
    Min. Order: 1 Piece/Pieces
    Delivery Time: 45 Days
    Packaging: Plywood Case
    Productivity: 10,000PCS/YEAR
    Brand: RSF or Customer's LOGO
    Transportation: Ocean,Land,Air,Train
    Place of Origin: China
    Supply Ability: 10,000PCS/YEAR
    Certificate: ISO CE WRAS
    HS Code: 7307190000
    Port: Shanghai,Dalian,Tianjin

Basic Info

Model No.: FC01

Product Description

RSF VALVE is a leading manufactuer of ductile iron pipe fittings. We have more than 15 years experience in producing ductile iron dismantling joint, flange adapter, flexible coupling, etc.

There is 5-10mm telescopic adjustment between socket of RSF VALVE's ductile iron flexible coupling (universal coupling). Another feature of our ductile iron flexible coupling (universal coupling) is the range of connections. Because of the large diameter of the pipe connected to the product, the line is allowed to have a±6º deviation when connecting the pipeline so that the normal movement of the pipe (such as ground subsidence, etc.). It can be used in the large bending radius pipeline caused the deviation.


Our ductile iron flexible coupling and universal coupling represents the latest mechanical coupling technology for connecting a variety of diameter pipes. The connect range can be from DN40 and DN2000. The customer has some special requirements of the product can also be designed and produced to meet Customer’s need. The simplicity and versatility of our flexible coupling and universal coupling make them suitable for many applications including pumping stations, water purification plants, sewage treatment plants, plant rooms, instrument rooms, power generation equipment, gas stations and all pipelines. Our flexible coupling and universal coupling are well suited for the installation of the flange pipe line, one end connecting the flange plate, the other end connecting socket pipe. Install easily and remove conveniently. Because of the large diameter of the pipe connected to the product, the line is allowed to have a±6ºdeviation when connecting the pipeline so that the normal movement of the pipe (such as ground subsidence, etc.). It can be used in the large bending radius pipeline caused the deviation.

Product design and manufacture according to BS,EN,ISO,9001:2015 system and surface anti-corrosion material through the most stringent WRAS certification, so it can be used for drinking water. Our flexible coupling and universal coupling coated with WRAS certified epoxy. For this anticorrosion coating, we provide excellent protection from transportation, storage, on-site and corrosion damage. We provide EPDM, NBR, SBR, nuts and bolts for carbon steel or stainless steel and long-term rust protection. Because this product can be connected to different pipe diameter of the pipeline, it can reduce the customer’s investment in the inventory.


Step 1.Check if the components of the product have been lost in transport and check for damage to the product surface.

Step 2. Clean the surface of the pipe spigot. The length is the half of the joint length.

Step 3. Check the product surface of the sealing ring and make sure that the surface is free of cracks and deformations which will interfere with the surface sealing effect of rubber ring.

Step 4.Draw an equal reference point on spigot end of pipe, which is half the length of the coupling joint, and calculate from the spigot end.

Step 5. Place a press pad at each pipe reference point.

Step 6. Apply the lubricant to the tube, The ramp is tilted toward the pipe end.

Step 7. Put the apron and robber on the tube, The ramp is toward the pipe end.

Step 8. Insert the middle sleeve into the pipe.

Step 9.The two connecting socket tubes should be parallel, axial alignment. When connecting, there is a gap of 5mm-10mm between the two socket pipes.

Step 10.Move the sleeve to ensure that the center of the sleeve is at the center of the spigot and socket pipe, and the distance between the two pipes is equal. The rubber ring is moved to the bell mouth of the sleeve.

Step 11.Move two end apron to the position of robber and align the bolt holes apron.

Step 12.Insert the bolt into the bore and tighten the bolt. The bolt shall be tightened alternately.

The nut shall be tightened according to the dimension of the bolt and the torque. After piping is pressurized, check if leakage caused by improper installation and settle it.


1. The bolt is not tight to meet the requirement torque.

2. A rock or fragment between a pipe and a gasket.

3. Dirt on bolts or nuts.

4. The distance between the spigot and the pipe is placed according to the requirement.

5. The two socket tubes are not parallel. Or not the same axis.

Warmly welcome to choose RSF VALVE's dutile iron dismantling joint. If you have any inquiry of our ductile iron pipe fittings such as dismantling joint, flange adapter, universal coupling, universal flange adapter, flexible coupling, please don't hesitate to contact with us!



Suzhou RSF Valve Co., Ltd is a professional valve manufacturing company. Our company was established in the year of 2010. We are committed to provide professional valves & valve parts solutin to Oil & Gas Industry and Water Works Industry. RSF - Reliability, Safety, and Friendship.

Our mission is to provide our customers with One-Stop Valve Solution which includes full range products, good quality control, competitive price, quick delivery and excellent after-sales service.

Our products line including two series of valves. The first series of our production line is Oil and Gas Industry Valves which includes Gate Valve, Globe Valve, Check Valve, Ball Valve, Butterfly Valve, Plug Valve, etc. Applicable standards of our Industry Valves include: basic design standards of API 600, API 6D, API 609, API 599, ASME B16.34, API 504, BS1873, BS1868, BS5351, EN593; Testing standards of API 598, API 6D, EN12266, API 607, API 6FA, etc. Cast steel material ranges: WCB, LCB, LCC, WC1, WC5, WC6, CF8, CF8M, CF3, CF3M, CF8C, 4A, 5A, etc. Forged steel material ranges: A105N, LF2, F11, F22, F304(L), F316(L), F321, F51, F53, F55, F61, etc. Pressure rating from Class 150 to Class 4500. Size range from 1/2" to 56".

The second series of our production line is Water Works Valves which includes Resilient Seat Gate Valve, Metal Seat Gate Valve, Non-Return Valve (Swing Check Valve, Dual Plate Check Valve, Nozzle Check Valve, Butterfly Tilting Disc Check Valve), Butterfly Valve, Globe Valve, Plug Valve, etc. Applicable standards, of our Water Works Valves include basic design standard of EN1171, DIN3352, DIN3202, BS5163, BS5153, EN593, AWWA C509, AWWA C515, AWWA C504, API 609, MSS SP, AS 2683.1, AS 2683.2; Testing standard of EN12266, API 598; Material ranges ductile iron GGG50, GGG40, EN-GJS 500-7. Pressure rating PN6, PN10, PN25, Class 125, Class 150. Size range from DN40 to DN3000 (1-1/2" to 120").

We are an exporting-oriented company. Around 90% our turnover is contributed from oversea market. Our main market is West Europe, America, Australia and Middle East area. Our valves have already been exported to more than 30 countries like USA, Canada, Brazil, Spain, Italy, Switzerland, Germany, France, UAE, Saudi, Iran, Australia, Russia, etc.

Our company have been certified by ISO9001:2015, CE, WRAS, and API.

RSF Valve's principle is Quality First, Customer First. We have been insisting on it and we will continuously provide our customers with high quality valves and satisfactory service.

Company Info

  • Company Name: SUZHOU RSF VALVE CO.,LTD
  • Representative: Jack Zhang
  • Product/Service: Trunnion Mounted Ball Valve , Floating Ball Valve , Ball Valve Componnents , EN593 Butterfly Valve , Ductile Iron Resilient Seat Gate Valve , Ductile Iron Metal Seat Gate Valve
  • Capital (Million US $): US$1Million
  • Year Established: 2010
  • Total Annual Sales Volume (Million US $): US$2.5 Million - US$5 Million
  • Export Percentage: 91% - 100%
  • Total Annual Purchase Volume (Million US $): US$2.5 Million - US$5 Million
  • No. of Production Lines: 3
  • No. of R&D Staff: 21 -30 People
  • No. of QC Staff: 21 -30 People
  • OEM Services Provided: yes
  • Factory Size (Sq.meters): 30,000-50,000 square meters
  • Factory Location: Dongchuang Hi-Teck Park, Mudu, Suzhou, Jiangsu, China
  • Contact Person: Mr. Jack Zhang
  • Tel: 86-512-66582398
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