Select from our range of precision-designed butterfly valves, gate valves, and flow control systems tailored to standard and customized industrial applications.
In severe chemical, oil, and gas environments, fluid control components face extreme degradation from corrosive reagents, abrasive slurries, and temperature oscillations. As premier Custom CF8 Butterfly Valve Manufacturers, we utilize cast austenitic stainless steel ASTM A351 Grade CF8 (equivalent to AISI 304 stainless steel) to manufacture high-durability flow control components designed for longevity and low-maintenance operation.
This paper details the metallurgical composition, pressure ratings, seating variants, and installation standards that define our custom valve manufacturing operations, supporting process engineers in making informed system design decisions.
CF8 is the cast designation equivalent to SS304. Containing approximately 18% Chromium and 8% Nickel, it offers excellent resistance to oxidizing acids, organic chemicals, and environmental atmospheres. It provides the optimum balance of mechanical strength, tensile properties, and cost-efficiency for industrial systems requiring corrosion mitigation.
| Material Designation | C % (Max) | Mn % (Max) | Si % (Max) | Cr % | Ni % | Tensile Strength (Min) | Yield Strength (Min) |
|---|---|---|---|---|---|---|---|
| ASTM A351 CF8 | 0.08 | 1.50 | 2.00 | 18.0 - 21.0 | 8.0 - 11.0 | 485 MPa (70 ksi) | 205 MPa (30 ksi) |
| ASTM A351 CF8M | 0.08 | 1.50 | 1.50 | 18.0 - 21.0 | 9.0 - 12.0 | 485 MPa (70 ksi) | 205 MPa (30 ksi) |
KR has more than 20 years of experience in producing standard and non-standard valves of various types. We supply a wide selection of over 500 valve products, including butterfly valve, gate valve, check valve, water control valve, as well as all their matching and accessory products. These products have applications in various industries such as water treatment, dam construction, commercial buildings, energy and heating, chemical engineering, etc. We have won high repeat purchase rates from customers with excellent product variety and quality.
Beyond product excellence, we are dedicated to creating a mutually beneficial partnership with every customer. We believe that reliable service is as crucial as superior products, and we strive to continuously optimize the customer experience to achieve long-term win-win cooperation. Today, KR VALVE’s products have been exported to over 50 countries and regions in Europe, Asia, Africa, and Oceania, providing project construction and brand marketing services to thousands of customers. We look forward to collaborating with you, leveraging our expertise, comprehensive product range, and unwavering commitment to quality and service to support your success.
The demand for custom CF8 butterfly valves has evolved beyond standard utility lines. Today, international industries require specialized components capable of managing varying flow dynamics, abrasive slurries, and regulatory environmental standards. As a global custom CF8 butterfly valve manufacturer, we engineer flow control products to serve multiple critical sectors:
Utilizing corrosion-resistant CF8 alloys prevents pitting and crevice corrosion in municipal water mains, industrial filtration, and saline desalination systems, ensuring potable water safety and structural integrity.
CF8 custom butterfly valves offer long-term resistance to organic acids, mild nitric acids, and hydrocarbon streams. High-temperature structural integrity provides reliable isolation and control in chemical refineries.
Designed for high-flow capacity with minimal pressure drop, these valves manage cooling water circulation and heating loops in large commercial buildings, industrial complexes, and municipal utility setups.
Our engineering, production, and testing processes are designed to produce reliable flow control components. The details below outline our technical operations:
Our R&D department drives continuous design improvements and innovations. KR engineers configure valve parameters, seal structures, and material specifications to match customer requirements. Our laboratory provides comprehensive testing capabilities to verify performance limits under simulated field conditions.
Production runs are executed under our ISO-9001 quality management framework. Equipped with over 30 advanced machining systems and assembly lanes, our experienced technicians process raw CF8 castings into finished valves. Monthly inventory audits support scheduled deliveries.
Our quality control department tests every valve before shipment, with a focus on leak prevention. In compliance with international standards (such as API 598 and EN 12266-1), we test structural dimensions, wall thickness, shell pressure resilience, and bubble-tight seat sealing.
Through specialized valve production, we provide customers with high quality, competitive pricing, and technical support.
We manufacture valves under our registered 'KR' brand and provide OEM/ODM services for established flow control distributors and international brands.
Our machining facility runs 15 precision lathes, millers, and boring centers alongside specialized manual and semi-automated assembly lines.
We manage over 20 product series and 500 varieties, producing standard and non-standard custom valves tailored to application-specific piping layouts.
We inspect components and cast materials, and monitor tolerances during machining to assemble fully tested finished products.
By managing foundry selection, machining, and assembly internally, we maintain competitive pricing without compromising dimensional quality.
Our technical team assists with valve selection, seal compatibility reviews, torque calculations, and after-sales support.
Industrial fluid systems require compliance with local safety standards and regulatory structures. Our custom CF8 butterfly valves are engineered to comply with international piping regulations:
ASME B16.34: Valves are constructed to meet prescribed wall thicknesses, pressure-temperature ratings, and pressure limits.
API 609: Governs butterfly valve designs across wafer, lug, and double-flanged bodies.
MSS SP-67 / MSS SP-25: Dictates standard testing regimes and standard identification markings for industrial valves.
EN 593: Harmonized European standard regulating resilient, metallic, and composite-seated industrial butterfly valves.
DIN EN 1092-1: Regulates standardized mating flanges, ensuring bolt circle diameters fit piping configurations.
BS 5155: Specifies material tests and requirements for cast iron and steel butterfly valves used in the UK and commonwealth infrastructure projects.
Step inside our production processes and watch tests on our butterfly valves, gate valves, and pressure control systems.
KR flow control valves are deployed across municipal, energy, and process piping systems worldwide:
Supplied customized heavy-duty water control valves and high-flow bypass systems, managing pressure control under variable high-head operating conditions.
Supplied large-diameter concentric butterfly valves and swing check valves for municipal water distribution networks in Northern Italy.
Installed abrasion-resistant knife gate valves and soft-sealed butterfly valves, handling slurries and high-solids wastewater media.
Supplied corrosion-resistant CF8 & CF8M alloy valves with Teflon (PTFE/FEP) linings to manage acidic wastewater in agricultural chemical production lines.
Supplied high-pressure steel ball valves and metal-to-metal seated gate valves tested for low-temperature sealing in sub-zero climates.
Provided automated water control valves and check valves for biological aeration basins and secondary settling tanks.
To meet evolving process demands and emission regulations, our engineering team focuses on three key areas of product development:
We are developing fire-safe, metal-to-metal, and triple-offset seating configurations designed to prevent leakage in applications up to 450°C (842°F).
Our updated stem packing configurations are designed to meet ISO 15848-1 standards for fugitive emissions, helping chemical plants minimize gas leakage.
We provide ISO 5211 mounting pads across our butterfly valve range, supporting integration with pneumatic, electric, and electro-hydraulic actuators.
Browse our primary product series designed for industrial, municipal, and commercial fluid applications:
Find technical details on our material grades, seating structures, and operational features below:
CF8 is the cast equivalent of AISI 304 stainless steel, containing Chromium and Nickel. CF8M is the cast equivalent of AISI 316 stainless steel, containing 2.0% to 3.0% Molybdenum. The addition of Molybdenum in CF8M provides higher resistance to chloride pitting and crevice corrosion compared to CF8, making it suitable for marine and high-chloride environments.
We recommend virgin PTFE or reinforced RPTFE seats for chemical resistance up to 200°C (392°F). For high-temperature or abrasive applications, a metal-to-metal seat with Stellite cladding provides reliability, while high-performance elastomer compounds like Viton (FKM) or EPDM are suitable for general services.
Yes. Our custom CF8 butterfly valves feature ISO 5211 top flanges, enabling direct mounting of standard pneumatic, electric, or hydraulic actuators without needing custom adapter brackets.
We manufacture butterfly valves in sizes ranging from DN40 to DN2000. Pressure ratings include ASME Class 150 and Class 300, as well as EN/DIN PN6, PN10, PN16, and PN25, depending on the body configuration and sealing system.
We perform hydrostatic shell and seat pressure testing in compliance with API 598, EN 12266-1, or ISO 5208. Soft-seated valves are tested to achieve zero visible leakage under standard hydrostatic conditions.
Browse our additional valve products, including stainless steel gate systems, hydraulic control valves, and strainers.
KR VAVLE
