About Millstong

Precision Engineering for Industrial Flow Control

Engineering-Focused Industrial Valve Manufacturer

Millstong Valve Co., Ltd. is an engineering-driven industrial valve manufacturer specializing in high-reliability flow control solutions for demanding service conditions.

We integrate R&D, precision manufacturing, performance testing, and technical support to deliver valves engineered for durability, safety, and long-term operational stability. Our products are widely applied in water treatment, petrochemical processing, power generation, municipal infrastructure, and industrial pipeline systems.

Our competitive advantage lies in measurable engineering performance.

Manufacturing & Processing Capability

Millstong operates a fully integrated manufacturing system covering:

Pattern development
Forging and casting (sand casting / precision casting)
CNC machining centers
Heat treatment
Surface coating and corrosion protection
Precision assembly and torque calibration
Performance testing and final inspection
Warehousing and logistics management

We support:

Standardized batch production
Non-standard customized manufacturing
Project-based supply

Technical Specifications & Service Capability

Temperature Range

Up to 525°C (triple-eccentric metal-seated butterfly valves)

Pressure Ratings

PN10 / PN16 / PN25 / PN40
ANSI Class 150 / 300
Maximum up to 4.0 MPa

Connection Types

Wafer type
Flanged type
Butt-weld type

Sealing Structures

Soft-seated (EPDM / NBR / PTFE optional)
Metal-seated
Triple-eccentric torque-seated design

Leakage Class

ISO 5208 Rate A
API 598 zero-leakage standard

Contact Our Team

Material Grades

Available body and trim materials include:

WCB
CF8
CF8M
CF3 / CF3M
C276 (Hastelloy)
Duplex stainless steel
Aluminum bronze
Ductile iron / Cast iron

All materials are supplied with MTC (Mill Test Certificates) and full traceability.

Applicable Standards

Products can be manufactured in accordance with international standards including:

API 609 (Butterfly Valves)
API 600 / 602 / 603 (Gate Valves)
API 598 (Pressure Testing)
ANSI / ASME B16.5
DIN / EN 1092
ISO 5211 (Actuator Mounting Interface)
GB / T standards

Export certification and special standard customization are supported.

Testing & Quality Control

Millstong operates a structured quality control system including:

Hydrostatic shell testing
Seat leakage testing
Dimensional and concentricity inspection
Surface defect inspection
Material chemical composition verification
Torque testing and cycle testing

Key products support:

Third-party inspection (SGS / BV / TÜV)
Factory acceptance testing
Inspection Test Plans (ITP) documentation

Quality control is implemented throughout design, manufacturing, and final verification.

Customization & Engineering Support

Millstong provides:

OEM / ODM services
Non-standard structural design
Special material selection for severe service
High-temperature and high-pressure structural optimization
Torque calculation and valve selection support
Technical drawing confirmation and optimization

We design valves based on actual service parameters to optimize flow coefficient (Cv), pressure drop control, and long-term operational reliability.

Application Industries