Comprehensive Technical Specifications
Component & System Parameter | Standard Industrial Specification & Field Options |
Brand / Manufacturer | SDF |
Valve Classification | Double-Eccentric Half-Ball Valve / Bi-Eccentric Semi-Ball Valve |
Body Structural Type | Single-Piece Cast or Forged Flanged Body, Half-Ball Plug |
Nominal Diameter Span | DN40 to DN1200 (DN500 model highlighted in reference image) |
Pressure Rating Options | PN10, PN16, PN25, PN40 / ASME Class 150, Class 300 |
Body Material Options | Carbon Steel (WCB/A105), Stainless Steel (CF8/CF8M), Alloy Steel |
Half-Ball Core Metallurgy | Stainless Steel SS304/SS316, or Carbon Steel with Hard Chrome Overlay |
Seat Sealing Ring Lining | Resilient EPDM/NBR, Hardened Metal-to-Metal Seat (Stellite Options) |
Applicable Fluid Media | Clean Water, Sewage/Sludge, Natural Gas, Petroleum Oils, Corrosive Liquids |
End Connection Style | Flanged Ends Conforming to ASME B16.5, EN 1092-1, or GOST Standards |
Actuation Configuration | Industrial Heavy-Duty Worm Gearbox with Handwheel (Bare-stem/Actuator ready) |
Design Standards | API 6D, ASME B16.34, JB/T 13517 |
Testing Compliance | API 598 Shell & Seat Leakage, ISO 5208 Rate A (Bubble Tight) |
Key Features and Engineered Advantages
Friction-Free Eccentric Cam Sealing Dynamics: The rotational stem centerline is deliberately offset from both the valve body center and the face seat centerline. This double eccentricity guarantees that the semi-ball hemisphere contacts the seal ring only at the definitive point of closure. During operation, mechanical friction between the ball and seat is completely avoided, resulting in a low operational torque curve that permits smaller, more cost-effective actuator selections.
Non-Clogging, Self-Cleaning Linear Flow Path: Unlike conventional full-bore balls which contain internal cavities that trap stagnant media, the half-ball architecture features an open, cavity-free bottom profile. When the valve is opened, high-velocity pipeline fluid sweeps straight through the flow bore, clearing accumulated silt, scaling deposits, and fibrous stringy matter. This self-cleaning action renders the valve nearly immune to jam-ups in sewage treatment and paper pulp applications.
Dual Resilient and Metal Sealing Versatility: Depending on site requirements, the SDF series can be configured with highly elastic elastomers (like EPDM or NBR) for absolute bubble-tight closure in gas and water utilities, or fitted with a hard metal-to-metal seating profile. The metal seat variants are layered with premium hard alloys to resist erosion when throttling abrasive process lines.
Robust Flanged Body Profile with Structural Feet: As shown in the reference file "image_a9725f.jpg", the valve is coated in a durable, high-build anti-corrosive epoxy lining, safeguarding the underlying metal against soil chemistry and harsh marine ambient environments. The robust flanged ends provide excellent structural stability under heavy pipe bending strains.
Field-Replaceable Sealing Elements: To lower long-term infrastructure maintenance costs, the valve seat ring is held in place by an accessible retaining ring. This allows service crews to inspect or replace the sealing element on-site without needing specialized grinding machinery or complete valve replacements.
Typical Industry Applications
The SDF double-eccentric semi-ball valve series is heavily utilized across diverse civil infrastructure and heavy-processing utilities:
Municipal Water & Wastewater Grids: Raw sewage isolation, pump station discharge manifolds, sludge drainage lines, and water treatment plant backwash networks.
Industrial Cooling Water Systems: Sea water cooling loops in power stations, chemical refinery water intake lines, and metallurgy processing lines.
Oil & Gas Gathering Utilities: Low-to-medium pressure unrefined gas lines, crude oil handling pipelines, and petroleum storage tank terminal manifolds.
Chemical & Paper Pulp Processing: Corrosive wash lines, low-consistency pulp stock transport, and slurry handling loops.
Quality Assurance and Operational Testing Protocols
To ensure reliable operation under unpredictable pipeline stresses, every SDF half-ball valve undergoes strict quality assurance procedures:
Pressure Testing Validation: Hydrostatic shell tests are conducted at $1.5 \times$ the nominal pressure rating, accompanied by dual-direction seat isolation checks per API 598 and EN 12266-1 benchmarks.
Epoxy Integrity Controls: Spark testing (holiday detection) is regularly applied over the thick internal and external epoxy coatings to confirm a pinhole-free barrier against electrochemical corrosion.
Torque & Cycle Profiling: Each assembly undergoes automated stroke calibration cycles prior to final packaging, verifying smooth stem travel throughout the full 90-degree movement range.
FAQ
1.When can I get a quotation?
We typically provide a quotation within 4 hours of receiving your inquiry. Urgent requests are given priority.
2.Do you support customized valves?
Yes. We support OEM and customized valves according to drawings, specifications, and special working conditions.
3.What is the production lead time?
Normally, production can be completed within 15 working days after order confirmation, depending on product type and quantity.
4.What standards do your valves comply with?
Our products comply with GB, ANSI, API, JIS, DIN, BS, and other international standards.
5.What pressure, size, and temperature ranges can you supply?
Pressure: Class 150-3500 Size: DN10-DN3000 Temperature: -196ºC to 610ºC
6.What certifications do you have?
We are certified with ISO 9001, CE, and provide third-party inspection and test reports upon request.
7.What delivery and payment terms do you offer?
Delivery terms: EXW, FOB, CFR, CIF
Payment terms: T/T (30% deposit + 70% balance), L/C, and other terms by agreement.
8.Do you provide technical support and spare parts?
Yes. We offer 24/7 technical support and supply spare and consumable parts for long-term service.
