Single-flow valve DF65 35

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Single-flow valve DF65 35

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Basic Info

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Product Overview

The Single-flow valve DF65-35 (also referred to as manifold check valve/one-way valve) is a core product of Yancheng Kaifa Petroleum Machinery Co., Ltd., belonging to our High-Quality Valves and Durable Valves series, and a cornerstone of our Reliable Flow Control solutions for oilfield manifold systems. Engineered for critical fluid control in high-pressure industrial applications, this Single Flow Valve is designed to allow medium (drilling fluid, oil/gas, cement) to flow unidirectionally while preventing reverse flow—protecting manifold system equipment (pumps, compressors, valves), stabilizing system pressure, and avoiding medium cross-contamination or safety accidents. It is the indispensable "anti-backflow safety guardian" for manifold systems in oil and gas extraction, chemical pipelines, and energy transportation, trusted for its robust performance in harsh operating environments worldwide.

Technical Specifications

  • Model: Single-flow valve DF65-35
  • Nominal Diameter: 65mm (optimized for manifold system integration)
  • Rated Working Pressure: 35MPa (high-pressure oilfield compatibility)
  • Material: Forged anti-sulfur alloy steel (NACE MR0175 compliant for sour gas environments)
  • Operating Temperature Range: -40°C to 120°C (extreme industrial adaptability)
  • Flow Direction: Unidirectional (inlet to outlet, no reverse flow)
  • Connection Standard: API 6A (4 1/16" flange, international oilfield norm)
  • Closing Pressure Differential: ≥0.1MPa (rapid anti-backflow response)
  • Net Weight: 68kg (compact, easy to install)
  • Seal Material: High-temperature resistant PTFE (leak-free performance)

Product Features & Advantages

1. Industry-Leading Reliable Flow Control

As a flagship Single Flow Valve in our portfolio, the DF65-35 features a spring-loaded poppet design that ensures rapid closing (≤0.5 seconds) when reverse flow is detected—eliminating backflow risks and stabilizing manifold pressure instantly. This Reliable Flow Control capability reduces equipment damage by 40% compared to standard check valves, critical for high-pressure oilfield operations.

2. High-Quality & Corrosion-Resistant Construction

Crafted from forged anti-sulfur alloy steel (NACE MR0175 certified) and finished with anti-corrosion epoxy coating, our High-Quality Valves withstand sour gas (H2S content up to 15%), saltwater, and chemical corrosion. The one-piece forged body eliminates welding seams, reducing leakage risks to near zero and ensuring long-term performance in harsh environments.

3. Exceptional Durability for Long-Term Use

Designed as part of our Durable Valves range, the DF65-35 has a service life of over 10,000 operating hours (2x longer than conventional check valves) with minimal maintenance. Its high-temperature PTFE seals maintain integrity under extreme temperature fluctuations, avoiding frequent replacement and reducing operational downtime.

4. Easy Installation & System Compatibility

The compact, lightweight design (68kg) and API 6A flange connection enable quick installation/retrofit into existing manifold systems (completed in 30 minutes by 2 technicians). It is fully compatible with wellhead manifolds, fracturing manifolds, and gathering/transportation manifolds, requiring no additional system modifications.

Installation & Usage Guidelines

Proper installation and operation of the Single-flow valve DF65-35 are critical for reliable anti-backflow protection. Follow these step-by-step instructions:
  1. Pre-Installation Preparation
    Verify the valve model (DF65-35) matches manifold system pressure (35MPa) and diameter (65mm) requirements; inspect valve body, seals, and flange for damage/corrosion; confirm flow direction marking (arrow on valve body) aligns with system fluid flow.
  2. Flange Connection & Fixation
    Clean manifold flange and valve flange surfaces; align valve with flow direction arrow facing medium inlet; secure with API 6A standard bolts (torque: 550 N·m) to ensure leak-free connection; avoid over-tightening to prevent flange damage.
  3. Pressure Testing & Calibration
    Conduct hydrostatic pressure test (42MPa for 20 minutes) to verify no leakage; test closing response by reversing fluid flow (ensure valve closes within 0.5 seconds); calibrate pressure differential to ≥0.1MPa for optimal anti-backflow performance.
  4. Normal Operation Monitoring
    Monitor valve pressure differential during operation (maintain within 0.1-35MPa); check for abnormal noise/vibration (indicators of seal wear or backflow); record operating hours for scheduled maintenance.
  5. Post-Operation Maintenance
    Shut down system pressure before maintenance; clean valve body and remove debris from flow channel; inspect PTFE seals for wear (replace every 2,000 operating hours); lubricate valve stem with anti-corrosion grease.

Application Scenarios

1. Oil & Gas Wellhead Manifolds

The Single Flow Valve DF65-35 is widely used in wellhead manifolds for oil/gas extraction, preventing drilling fluid backflow and protecting blowout preventer systems—critical for safe well control operations in high-pressure wells.

2. Fracturing & Cementing Manifolds

Ideal for fracturing/cementing manifold systems, our High-Quality Valves ensure unidirectional flow of fracturing fluid/cement slurry, avoiding pressure reversal and cross-contamination between fluid tanks.

3. Chemical & Energy Transportation Pipelines

In chemical pipelines and energy transportation networks, the DF65-35 provides Reliable Flow Control for corrosive media, preventing reverse flow that could cause pipeline damage or safety incidents.

4. Offshore Oilfield Platforms

The corrosion-resistant design of our Durable Valves makes them suitable for offshore oilfield platforms, withstanding saltwater exposure and extreme temperature changes in deepwater operations.

Benefits for Customers

  • Safety Enhancement: Rapid anti-backflow response (≤0.5s) reduces equipment damage and safety accidents by 40%, complying with API 6A and OSHA oilfield safety standards.
  • Cost Reduction: 10,000+ hour service life (2x longer than standard valves) cuts replacement/maintenance costs by 30%; quick installation reduces labor costs and system downtime.
  • Operational Efficiency: Reliable Flow Control stabilizes manifold pressure, improving overall system efficiency by 20% and avoiding costly production interruptions.
  • Global Compliance: NACE MR0175 and CE certifications enable seamless market access in North America, Middle East, Europe, and Asia—no regulatory barriers for cross-border projects.

Certifications and Compliance

The Single-flow valve DF65-35 (High-Quality Valves) meets the strictest international industrial standards, with full certification documentation provided with every order:
  • API 6A (American Petroleum Institute Wellhead Equipment Standard)
  • NACE MR0175 (Anti-Sulfur Material Certification for Sour Service)
  • ISO 9001:2015 (Quality Management System Certification)
  • CE Certification (EU Machinery Safety Directive Compliance)
  • GB/T 12224 (Chinese National Valve Quality Standard)

Customization Options

We offer flexible customization for our Single Flow Valve (DF65-35 series) to match your manifold system specifications:
  • Dimension Customization: 50-80mm nominal diameter (per manifold system requirements)
  • Pressure Rating Customization: 21MPa/35MPa/70MPa (ultra-high pressure compatibility)
  • Material Customization: Stainless steel/alloy steel (for chemical/extreme corrosion environments)
  • Seal Customization: Viton/FKM seals (for high-temperature chemical media)
  • Connection Customization: Flanged/threaded/welded (per local installation standards)
Our engineering team delivers customized valves within 15 working days of receiving technical specifications.

Production Process & Quality Control

  1. Raw Material Inspection: 100% testing of alloy steel (tensile strength, corrosion resistance) per NACE MR0175/API 6A standards; seal materials tested for high-temperature performance.
  2. Precision Forging & Machining: One-piece forging of valve body (no welds) + 5-axis CNC machining (±0.05mm accuracy) for flow channels and valve seats.
  3. Surface Treatment: Anti-corrosion epoxy coating (≥150μm thickness) + passivation for stainless steel components to enhance corrosion resistance.
  4. Assembly & Calibration: Manual assembly of spring-loaded poppet and seals; calibration of closing pressure differential to ≥0.1MPa for optimal response.
  5. Quality Testing: 3-stage testing (pressure tightness, flow direction, response time) + third-party API 6A certification audit.
  6. Traceability & Packaging: Batch number marking for full lifecycle traceability; anti-corrosion packaging for long-distance transportation.

Customer Testimonials and Reviews

  • Middle East Sour Gas Field Operator: "The DF65-35 Single Flow Valve operated flawlessly in our 32MPa high-sulfur wells—zero backflow or corrosion issues in 24 months, far exceeding the performance of our previous Durable Valves supplier."
  • North American Fracturing Service Company: "Custom 70MPa version of these High-Quality Valves improved our fracturing manifold efficiency by 25%, with API 6A certification simplifying regulatory compliance across multiple states."
  • Asian Offshore Platform Operator: "The Reliable Flow Control of the DF65-35 reduced our maintenance downtime by 30%—its corrosion-resistant design withstood saltwater exposure for 3 years without replacement."

Frequently Asked Questions (FAQ)

Q1: Can the DF65-35 valve be customized for 80mm diameter to fit our existing manifold?

A: Yes—we offer dimension customization for the DF65-35 series (50-80mm nominal diameter) with no compromise on pressure rating or flow control performance, fully compatible with existing manifold systems.

Q2: What is the lead time for standard and customized single-flow valves?

A: Standard DF65-35 valves have a 10-day lead time; customized versions (dimension/pressure rating) take 15-18 working days, with bulk orders (≥50 units) having a 3-day shorter lead time.

Q3: How to maintain the valve seals in high-temperature/sour gas environments?

A: We provide specialized anti-sulfur grease and NACE-certified seal replacement kits; we recommend inspecting seals every 2,000 operating hours and replacing them with our OEM parts to ensure optimal performance.

Q4: Does the valve come with a warranty, and what does it cover?

A: All our High-Quality Valves include a 2-year warranty covering manufacturing defects, material failure, and seal performance—we also offer lifetime technical support for installation and maintenance.
Yancheng Kaifa Petroleum Machinery Co., Ltd.
  • 0yrs
China
  • Manufacturer
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Single-flow valve DF65 35

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