Design and production together
Two production bases in Wenzhou and Yunhe support our CAD design and custom development capabilities across power plant, American-standard and general industrial valve ranges.
01 / ABOUT SHUANGHUA
Built around demanding service.
Designed, manufactured
and checked with care.
Shuanghua Valves
Based in Anfeng Industrial Zone, Wenzhou, a major valve manufacturing hub in China, we specialise in high-temperature, high-pressure power plant valves. Our range also includes valves to American standards and general industrial valves.
Our CAD design centre and inspection and testing facilities bring design, production and quality checks together. Capabilities include material analysis, mechanical testing, non-destructive testing, plasma weld surfacing and test benches for medium and large valves.
From shut-off and backflow prevention in water and steam lines to boiler and turbine drain and blowdown service, we help match the valve model, design and material to the duty. Custom designs are also available.
For steam, water and process lines
Our range covers shut-off, backflow prevention, boiler blowdown, turbine drains, extraction steam and high-pressure feedwater heater systems, serving both main lines and auxiliary systems.
Designed with maintenance in mind
Design options include erosion-resistant valves with replaceable internal parts, linked dual-disc designs and pressure-seal bonnets, addressing seat protection and maintenance needs.
02 / ENGINEERING & MANUFACTURING
Manufacturing capability.
From design to the final detail.
Choose a standard valve or discuss a custom design. We work from your fluid, temperature, pressure and installation conditions to match the valve design, connections and operator to the application.
In-house CAD and custom designs
We design and manufacture custom valves to customer requirements. Discussions cover the valve construction, materials and connection dimensions of the relevant series.
Seat surfacing and finishing
Our facilities include plasma weld surfacing equipment. Power plant gate valves use hard-alloy overlays on sealing faces and corrosion-resistant nitriding on stems to address wear and scuffing.
Manual and powered operation
Options include handwheel, gearbox, electric, pneumatic, hydraulic and electro-hydraulic operation. Power plant gate valves fitted with multi-turn electric actuators can support local and remote operation.
Matched to the installation
Power plant gate valve designs can be configured to customer requirements. Erosion-resistant series offer butt-weld or socket-weld connections and handwheel, gearbox, electric or pneumatic operators, depending on the model.
03 / PRODUCT CAPABILITY
Main line valves.
Power plant auxiliaries, too.
Our valve families cover main line shut-off and backflow prevention, drains and blowdown, extraction steam and high-pressure feedwater heater systems. Design, connection and operator options serve different positions in the plant.
Line shut-off
High-temperature, high-pressure gate and globe valves
Z61Y / Z62Y / J61Y
Drains & blowdown
Erosion-resistant, replaceable-trim and dual-seal valves
KJ68Y / SHKJ68Y / SHVKJ69Y / SHFKJ62Y
Backflow prevention
Lift, swing, vertical and Y-pattern check valves
H61Y / H64Y / H62Y / H67Y
Plant auxiliaries
Extraction steam check valves, feedwater heater inlet/outlet valves and hydrostatic test valves
H664Y / GJR964Y / H62Y / SD61Y
Flow control
Control valves
T967Y / T968Y / T969Y
Flanged valves
Bolted-bonnet gate and globe valves; flanged check valves
Z41Y / Z42Y / J41Y / H41Y / H44Y
04 / QUALITY ASSURANCE
Strict on quality.
Careful with every detail.
High-temperature, high-pressure service demands careful checks of materials, pressure-retaining parts and sealing performance. We apply these checks through material verification, component inspection, machining checks and valve testing, to suit the product standard and duty.
01 / MATERIAL VERIFICATIONBody, bonnet and disc.
Body, bonnet and disc.
The material matters.
We check the chemical composition of key parts. Material analysis and mechanical testing help verify that materials meet the requirements of the relevant valve.
Careful material checks.
A sound basis for pressure and sealing performance.
A sound basis for pressure and sealing performance.
VALVE BODY
BONNET
CHECK VALVE DISC02 / SURFACE DEFECT CHECKS
A close look at sealing parts.
Dye penetrant inspection
Dye penetrant inspection helps reveal surface-breaking defects in sealing parts. The photos show two stages of the same inspection process.
03 / INTERNAL DEFECT CHECKS
Check beyond the surface.
Where applicable, ultrasonic, radiographic and other non-destructive methods are used to check for internal defects in pressure-retaining parts.
04 / MACHINING & PROPERTY CHECKS
Check the details that matter.
Wall thickness, hardness and other checks help verify component dimensions and material properties, with attention to machining details that affect service.
05 / PRESSURE & SEAL TESTINGFrom individual parts
From individual parts
to pressure and sealing performance.
Valve test equipment is used to check strength, sealing and other required performance. Test scope and acceptance requirements follow the valve type and applicable standard.
05 / QUALIFICATIONS & DEVELOPMENT
Manufacturing credentials and product development.
Special Equipment Manufacturing Licence
China · Pressure piping components / metal valves
Double-seal globe valve invention patent
Patented double-seal globe valve design
Zhejiang technology enterprise recognition
Recognition for a technology-based small or medium-sized enterprise.
06 / FLAGSHIP VALVES
Our core valve range.Shut-off and backflow prevention.
High-temperature, high-pressure valves for oil & gas, chemical and power applications.
Match the valve to the duty, from line isolation to preventing reverse flow.
01 / GATE VALVES
Power plant gate valves
Z61Y / Z62Y
MAIN DUTY
Open or isolate the line for shut-off service in industrial pipelines.
Capabilities
- Straight-through flowA straight, full-diameter flow path helps reduce flow resistance.
- Pressure-seal bonnetA pressure-seal bonnet arrangement is designed for high-pressure service.
- Sealing faces and stemHard-alloy overlays on sealing faces; corrosion-resistant nitriding on the stem.
TYPICAL APPLICATIONS
Oil, chemical, hydroelectric and thermal power plant pipelines.
WHAT TO CHECK
Confirm size, pressure-temperature rating and materials. Match the closure design and manual or powered operator to the application.
02 / GLOBE VALVES
Power plant globe valves
J61Y
MAIN DUTY
Shut-off in water, steam and oil lines.
Capabilities
- Welded connectionsWeld-end connections for pipeline installation.
- Compact, rigid bodyCompact construction and good rigidity, with installation and maintenance needs in mind.
- Seat and packing optionsSealing faces use the specified steel or hard alloy, with flexible graphite packing.
TYPICAL APPLICATIONS
Power plant steam and water systems, and high-temperature, high-pressure industrial lines.
WHAT TO CHECK
Select the model and materials for the fluid, temperature and pressure. Check weld-end dimensions and installation space.
03 / CHECK VALVES
High-pressure check valves
H61Y Lift / H64Y Swing
MAIN DUTY
Open and close with the flow to prevent reverse flow in the line.
Capabilities
- Lift or swing designChoose lift or swing construction to suit the pipeline conditions.
- Pressure-retaining sealBonnet sealing arrangements vary by series to suit the pressure requirements.
- Disc and seat materialsDisc and seat sealing faces use alloy steel or hard-alloy overlays.
TYPICAL APPLICATIONS
Backflow prevention in oil, chemical and thermal power plant pipelines.
WHAT TO CHECK
Check flow direction, mounting arrangement and service conditions. Confirm lift or swing design and the connection dimensions of the chosen model.
Materials, pressure ratings and connections depend on the model and service conditions.
Discuss your requirements →
SHVKJ69Y / Erosion-resistant globe valve with replaceable internals07 / PRODUCT ENGINEERING
Practical design.
Easier maintenance.
SHVKJ69Y erosion-resistant globe valve
For boiler and turbine drains and intermittent boiler blowdown service.
Replaceable seat
The seat can be replaced during maintenance without removing the valve body from the line.
Protected sealing faces
The disc sealing face is recessed within the disc’s lower lip, while the seat sealing face is shielded beneath the cage.
Multi-stage pressure reduction
An erosion-resistant arrangement reduces pressure in stages, with further reduction in the valve chamber.
08 / STRUCTURAL ADVANTAGES
Different designs.
Matched to different duties.
Pressure-seal construction, replaceable internal parts and linked dual-disc designs address different needs in demanding service, from erosion of sealing faces to maintenance access. Each series is designed around its intended duty.
Pressure-seal gate valvePressure-seal bonnet.
Pressure-seal bonnet.
Engineered sealing faces and stem.
A straight, full-diameter flow path is paired with a pressure-seal bonnet. Gate and seat sealing faces have hard-alloy overlays, and the stem is treated with corrosion-resistant nitriding.
Closure designs can include single-disc, double-disc and parallel double-disc arrangements, according to customer requirements.
SHFKJ62Y / Dual-seal valveTwo independent seals.
Two independent seals.
One linked stem.
Two separate discs and their seats form two sealing arrangements. A single operator drives the linked stem, opening and closing the discs in sequence.
Used for shut-off in power plant steam and water lines. During closing, the outlet seal acts first, followed by the inlet seal. The sequence helps protect both sealing arrangements from direct flow erosion.
09 / PROJECT MATCHING
Tell us your operating conditions.
We will work through the details.
Design and manufacturing standards include GB, JB, ANSI, API, BS, JIS, DIN, ASME, NB and DL/T. The applicable standard is agreed for the valve series and project, together with construction, materials and connection dimensions.
Tell us the fluid, operating temperature and pressure, and whether the duty is shut-off, backflow prevention, drainage or blowdown.
Confirm size, connections, available space, materials and sealing requirements against the construction and dimensions of the relevant series.
Share your manual or powered operation requirements, quantity and required technical documents so we can confirm the model and quotation.
Applications and markets
Our valves serve power, oil, chemical, metallurgical, machinery, mining, paper and pharmaceutical applications. Our markets include China, Southeast Asia, Eastern Europe and the Middle East.
Industries
For oil & gas, chemical and power projects
Start with the application, then confirm the model and service requirements.
Oil & gas
For shut-off and flow-direction requirements in process lines. Discuss valve design, pressure rating and connections with us.
Chemical processing
Match materials and valve specifications to the fluid, temperature and sealing requirements of the process.
Power generation
For high-temperature, high-pressure steam and water lines, plus boiler and turbine drains and blowdown service.
INDUSTRIAL VALVE PORTFOLIO
A broad valve range.
Configured for your duty.
From line shut-off and backflow prevention
to demanding drains, blowdown and power plant auxiliary service.
Gate valvesGlobe valvesCheck valvesErosion-resistant valvesControl valvesPower plant auxiliaries
A broad range
Power plant, American-standard and general industrial valves for a wide range of pipeline duties.
Design choices
Choose the sealing arrangement, connections and operator to suit the application.
Custom designs
Discuss a custom valve design for your fluid, temperature, pressure and installation requirements.
Need a valve or a quotation? Let’s talk.
Send us your service conditions and requirements. We will help you select the valve and prepare a quote.
SHVK / SHUANGHUA VALVES
Oil & gas · Chemical · Power