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The gate valves provided by Weldon mainly include bolted bonnet wedge gate valves and pressure seal bonnet gate valves, which are widely used in gas, petrochemical, oil, offshore, power station and refining industries. The opening and closing of the gate valve depend on the movement of the disk perpendicular to the direction of the fluid, which is usually used to cut off the medium and cannot be used to regulate the flow.
Gate valve is usually divided into rising stem gate valves and nor-rising stem gate valves. The rising stem gate valves is widely used due to easy lubricate and observe, the nor-rising stem gate valves remains at the same height during the opening and closing process, it is suitable for installation where the space is limited.

Gate Valve Design Features:
Disc: flexible wedge by default, solid wedge can be provided upon request.
Seat: Renewable seat and non-renewable seat are both available.
Body - Bonnet Connection: Bolted bonnet (BB) is normally applied on CL150 - CL1500, body bonnet seal is defaulted by gasket and RTJ ring. Pressure seal bonnet is applied on CL1500 - CL2500 with pressure seal ring for connection between body and bonnet.
Packing: graphite packing by default, PTFE packing on corrosive media. API 622 fugitive emission packing can be available upon request.
Back seat: Renewable back seat is applied on carbon steel and low alloy steel valve, integral back seat is applied for stainless steel valve.
Actuation: Hand wheel and gear box are normally designed for cast gate valve based on different size and pressure rating; Electric, pneumatic or Chain wheel operation can be provided upon request.

Product Range: 
Size: 2" - 60" (DN50 - DN1500)
Pressure Rating: Class 150 LB - 2500 LB (PN16 - PN420).
Material: Carbon steel, Stainless steel, Alloy steel, including WCB、GS-C25、LCB、LCC、LC1、LC3、CF8、CF8M、CF3、CF3M、WC6、C5、C9、C12、4A、5A、MONEL、ALLOY20、C95800.
Connection End: BW, RTJ, Flanged.
Operation: Handwheel, Gearbox, Electric, Pneumatic.
Design & Manufacture Standard: API 600, ASME B16.34, DIN 3352, EN 1984, Bolted bonnet, pressure bonnet, bellow seal bonnet, high / low temperature extended bonnet and ISO 15848 fugitive emission designed valves are available upon different request of services.
Test Standard: API 598, EN 12266.
 
The globe valves provided by Weldon mainly include straight pattern globe valve, Y pattern globe valve, both bolted bonnet and pressure seal bonnet type are available , which are designed and manufactured according to DIN and ASME, The globe valve is suitable for several media including water, steam, oil, gas, petrol products, nitric acid, acetic acid, etc.

The globe valve, also called stop valve, relies on the pressure of the stem, making the sealing surface between disc and seat closely fitted to prevent the circulation of the medium.  As the short opening and closing stroke of stem, globe valve has a reliable cut-off function. Due to the change of the valve seat opening is proportional to the stroke of the valve flap, it is suitable for the flow regulation and frequent operation.

Design features:
Disc: Single disc by defaultand double disc is applied for larger pressure difference or bigger size, the flow diretcion can be from lower inlet to higher out let, and from higher inlet to lower outlet is normally used for refinery to ensure the protetc stem seal from leakage. 
Flat disc, conical disc, and plug loose type disc can be made upon request.
Seat: Welded seat and integral seat.
Body - Bonnet Connetcion: Bolted bonnet (BB) is normally applied on CL150 - CL900, body bonnet seal is defaulted by gasket and RTJ ring. Pressure seal bonnet (PSB) is applied on CL1500 - CL2500 with pressure seal ring for body bonnet seal.
Packing: By default graphite packing is used, PTFE packing can be used on corrosive media. API 622 fugitive emission packing will be used upon request.
Back seat: Renewable back seat is applied on carbon steel and low alloy steel valve, body back seat is applied for stainless steel valve.
Actuation: Hand wheel and gear box are normally designed for cast gate valve based on different size and pressure rating; Eletcric, pneumatic or Chain wheel operation can be provided upon request.

Product Range: 
Size: 2 Inch - 24 Inch (DN50 - DN600).
Pressure Rating: Class 150 LB - 2500 LB (PN16 - PN420).
Material: Carbon steel, Stainless steel, Alloy steel, including WCB, GS-C25, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, WC6, C5, C9, C12, 4A, 5A, MONEL, ALLOY20, C95800
Connetcion End: BW, RTJ, Flanged.
Operation: Handwheel, Gearbox, Eletcric, Pneumatic.
Design & Manufacture Standard: ASME B16.34, BS 1873, DIN 3356, Bolted bonnet, pressure bonnet, bellow seal bonnet, high/low temperature extended bonnet and ISO 15848 fugitive emission designed valves are available upon different request of services.
Test Standard: API 598, EN 12266.

 
The check valves provided by Weldon mainly include Swing check valve, Pressure sealed cover check valve, Wafer check valve, etc. Check valve, also called non-return valve, is mainly installed on the pipeline, allowing the medium to flow in only one diretcion.
Weldon check valves offer simple structure, less parts, convenient maintenance and repair and low failure rate. The full open disc design is applied to provide a larger opening flow area after disc opening, small fluid resistance and large valve flow coefficient. Counter weight or damp structure can be applied to reduce the impact of water hammer while disc opening.

Product Range: 
Size: 2 Inch - 60 Inch (DN50 - DN1500)
Pressure Rating: Class 150 LB - 2500 LB (PN16 - PN420)
Material: Carbon steel, Stainless steel, Alloy steel, including WCB, GS-C25, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, WC6, C5, C9, C12, 4A, 5A, MONEL, ALLOY20, C95800
Connetcion End: BW, RTJ, Flanged.
Design & Manufacture Standard: API 6D, DIN 3352, BS 1868.
Test Standard: API 598, EN 12266.
 
The ball valves provided by Weldon mainly include Trunnion mounted ball valves, Floating ball valves, Double block and bleed ball valves, Fully Welded ball valves, Top entry ball valves, Metal seal ball valves, etc. 
The ball valves are open when the ball's hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle, the ball is driven by the valve stem and can be closed tightly with a small torque. Due to its ease operation, repair, and versatility, ball valve is widely used in petroleum refining, chemical, eletcric power pipeline to cut, regulate and change the flow diretcion of the medium.

Product Range: 
Size: 1/2 Inch - 60 Inch (DN50 - DN1500).
Pressure Rating: Class 150 LB - 2500 LB (PN16 - PN420).
Material: Carbon steel, Stainless steel, Alloy steel, including WCB, GS-C25, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, WC6, C5, C9, C12, 4A, 5A, MONEL, ALLOY20, C95800.
Connetcion End: RTJ, BW, Flanged.
Operation: Level, Worm gear, Eletcric, Pneumatic.
Design & Manufacture Standard: API 6D.
Test Standard: API 598, API 6D.
 
The butterfly valves provided by Weldon mainly include centric butterfly valve, double offset, triple offset, Lug type, Wafer type, Flanged ended butterfly valve etc. 

The butterfly valve is similar to ball valve, also called quarter-turn valves. It is fully open or closed when the disc is rotated a quarter turn. Butterfly valve is widely used in the pharmaceutical, chemical, and food industries due to lower cost and ease of installation.

Product Range: 
Size: 2 - 120 Inch (DN50 - DN3000).
Pressure Rating: Class 150 - 600 LB (PN16 - PN100).
Material: Cast iron, Carbon steel, Stainless steel, Alloy steel, including WCB, GS-C25, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, WC6, C5, C9, C12, 4A, 5A, MONEL, ALLOY20, C95800.
Connection End: Wafer, Lug, Flanged.
Design & Manufacture Standard: API 609.
Test Standard: API 598.
 
The Forged valves provided by Weldon mainly include small size forged steel gate valve, forged steel globe valve and forged steel check valve, size range 1/4 - 2 Inch (DN15 - DN50), rating range Class 150 - 2500 LB(PN16 - PN420), forging materials in A105N, LF2, F11, F22, F304, F316, F304L, F316L etc.

During the forging process, the structure of metal becomes more compact, the plasticity and mechanical properties are improved, the mechanical properties of the forgings are normally higher than castings in same material. Considering the cost factor, forged valves are less than 2 inch, especially for high pressure, preferred for forging.

Product Range: 
Size: 1/4 Inch - 2 Inch (DN15 - DN50).
Pressure Rating: Class 150 LB - 2500 LB (PN16 - PN420).
Material: Forged Carbon steel, Stainless steel, Alloy steel, A105N, LF2, F11, F22, F304, F316, F304L, F316L etc.
Connetcion End: NPT, SW, BW, RTJ, RF.
Operation: Handwheel, Eletcric.
Design & Manufacture Standard: API 602.
Test Standard: API 598.
 
The safety valves / pressure relief valves provided by Weldon mainly include spring-loaded safety valve, pilot-operated safety valve, bellow balanced safety valve and changeover valve (switch device). The calculation sheet could be provided for all projetc and all the safety valves are designed and manufactured according to API 2000, API PR520 and API 526.

Safety valve is the safe guard in the pressure vessels such as chemical plants, eletcric power boilers and gas storage tanks, acting as a protetcion equipment from exploding or damaging. The safety relief valve is opened automatically to relief when the system pressure exceeds the set pressure, and resumes closed when the system pressure bellow the set pressure.

Product Range: 
Size: 1/2 Inch - 24 Inch (DN10 - DN600).
Pressure Rating: Class 150 LB - 2500 LB (0.6 - 42.0 Mpa).
Working Temperature: -196 - 570℃.
Material: Carbon steel, Stainless steel, Alloy steel, including WCB, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, WC6, C5, C9, C12, 4A, 5A, MONEL, ALLOY20, C95800, etc.
Connetcion End: Flanged, Thread.
Design & Manufacture Standard: API 520, API 526, API 527.
Apply To: Power Generation, General Industrial, Oil & Gas, Refining, Petrochemical, Chemical, Urea & Paper, Desalination.
 
The Pipe Strainer / Filter provided by Weldon mainly include Y type strainer, T type strainer and Basket type strainer. which are important components of piping systems to protetc equipment such as pump and valve from potential damage due to dirt and other particles that may be carried by the process fluid. Pipe strainers can be installed upstream of pumps or valves to protetc them from construction debris that may have been left in the pipe. While the Strainer improves the clearance in the medium, and prolongs the life of pumps, valves and other equipments. It is suitable for water, Air, Gas, petroleum, steam and other fluids. It is easy maintenance when cleaning is required.

Product Range: 
Size: 2 Inch - 24 Inch (DN50 - DN600).
Pressure Rating: Class 150 LB - 600 LB (PN16 - PN100).
Material: Carbon steel, Stainless steel, Alloy steel, including WCB, GS-C25, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, WC6, C5, C9, C12, 4A, 5A, MONEL, ALLOY20, C95800, etc.
Connetcion End: BW, RTJ, Flanged.
Design & Manufacture Standard: ASME B16.34, DIN 3352.
Test Standard: API 598, EN 12266.
 
The power plant valves provided by Weldon are mainly large size with high pressure high temperature forged valves. Compared with other valve products, Power station valves are characterized by high temperature and high pressure, normally adopted by pressure self-sealing design and open die forging (free forging) process. The valves are also widely used in the chemical industry.

Product Range: 
Size: 2 Inch - 12 Inch (DN50 - DN300)
Pressure Rating: Class 150 LB - 4500 LB (PN16 - PN760)
Material: Carbon steel, Stainless steel, Alloy steel, including WCB, GS-C25, LCB, LCC, LC1, LC3, CF8, CF8M, CF3, CF3M, WC6, C5, C9, C12, 4A, 5A, MONEL, ALLOY20, C95800, etc.
Connetcion End: Flanged.
Design & Manufacture Standard: ASME B16.34
Test Standard: MSS SP 61.
 
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