Description

Dart Check Valves

1″–3″ | 15,000 PSI CWP | N₂ & CO₂ Service | Explosive Decompression Resistant | 1902 MxF

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CAMTOP Dart Check Valves are specifically engineered for extreme nitrogen and carbon dioxide service applications, handling both wet and dry non-erosive flow conditions. Featuring explosive decompression resistant materials and a low-inertia hollow dart design, these valves deliver reliable performance in high-velocity gas environments exceeding 250 feet per second. The main seal located on the seat reduces exposure to flow, enabling economical seal replacement without replacing the seat or dart — significantly lowering maintenance costs and downtime.

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Product Image

CAMTOP Dart Check Valve — Compact design with 1902 hammer union connection, ideal for nitrogen and CO₂ service

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Key Features

• Explosive Decompression Resistant: Specialized materials and design minimize explosive decompression damage, ensuring long service life in high-pressure gas applications
• N₂ and CO₂ Capability: Stainless steel internal components and special elastomer seal handle gas velocities in excess of 250 feet per second in nitrogen and carbon dioxide environments
• Low-Inertia Dart Design: Hollow dart and fixed stem minimize the pressure differential required to initiate flow. Non-metallic bushing reduces friction, extending dart and stem service life
• Easy, Low-Cost Service: Main seal is strategically located on the seat, reducing exposure to flow erosion. Seal can be replaced independently without replacing the seat or dart — minimizing parts cost and downtime
• Compact Construction: Short overall length and low weight make these valves ideal for space-constrained installations and mobile well service units
• High Pressure Rating: 15,000 PSI CWP working pressure for demanding well service and stimulation applications
• Multiple Sizes Available: 1″, 1½″, 2″, and 3″ nominal sizes to accommodate various flow requirements
• Standard & Reverse Flow Options: Both standard and reverse flow configurations available for flexible system integration
• Stainless Steel Internals: Corrosion-resistant stainless steel internal components ensure compatibility with aggressive gas media
• API 6A / NACE MR-01-75 Compliant: Manufactured to meet or exceed industry standards for oilfield valve applications

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Technical Specifications

Size	CWP (PSI)	Service	End Connections	Flow	Part Number	L (in/mm)	OD (in/mm)	Weight (lb/kg)	Repair Kit	Elastomer Set
1″	15,000	Standard	1902 MxF	Standard	P536118	14.04 / 356	10.31 / 262	76 / 35	P518835	P518834
1½″	15,000	Standard	1902 MxF	Reverse	P523811	14.04 / 356	10.31 / 262	86 / 39	P518835	P518834
	15,000	Standard	1902 MxF	Standard	P525269	14.04 / 356	10.31 / 262	84 / 39	P518835	P518834
2″	15,000	Standard	1902 MxF	Standard	P510771	14.04 / 356	10.31 / 262	87 / 40	P518835	P518834
3″	15,000	Standard	1902 MxF	Standard	P510773	15.67 / 398	11.43 / 290	130 / 59	P519874	P519873

Note: All dimensions are approximate. Refer to certified engineering drawings for exact measurements. Custom configurations available on request.

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Main Components

No.	Component Name	Material / Description	Function
1	Valve Body	High-strength alloy steel with 1902 hammer union profile	Primary pressure-containing structure; provides inlet and outlet flow paths with threaded hammer union connections
2	Dart	Hollow stainless steel with low-inertia profile	Primary flow control element; hollow design minimizes pressure differential required to start flow, reducing opening lag
3	Seat	Hardened alloy steel with integrated seal groove	Provides sealing surface for dart; main seal located on seat reduces exposure to flow erosion and enables independent seal replacement
4	Spring / Stem Assembly	Stainless steel spring with fixed stem and non-metallic bushing	Maintains dart in closed position against back pressure; non-metallic bushing reduces friction and extends dart/stem life

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Assembly Drawing

Dart Check Valve Cutaway — ① Valve Body, ② Dart, ③ Seat, ④ Spring / Stem Assembly

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Applications

• Nitrogen Service: Ideal for nitrogen displacement, gas lift, and foam fracturing operations where explosive decompression resistance is critical
• Carbon Dioxide Service: Handles CO₂ injection, EOR (Enhanced Oil Recovery), and acid gas stimulation with specialized elastomer compatibility
• Stimulation Operations: Reliable check valve protection for high-pressure hydraulic fracturing and acidizing treatments
• Gas Well Servicing: Prevents backflow in high-velocity gas well intervention and workover operations
• Well Testing: Ensures safe pressure testing and flowback control in nitrogen and CO₂ well test environments
• Mobile Well Service Units: Compact design and low weight make these valves ideal for truck-mounted and skid-mounted well service equipment

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Quality Assurance & Testing

• Material Certification: All materials accompanied by mill test certificates (MTC) and chemical composition reports
• Hydrostatic Pressure Testing: Each valve hydrostatically tested to 1.5× working pressure per API 6A requirements
• Seat Leak Test: Zero leakage seat test conducted at rated working pressure
• Explosive Decompression Test: Elastomer seals tested for explosive decompression resistance per NACE and API standards
• Dimensional Inspection: Critical dimensions verified with CMM and precision gauges against engineering drawings
• Final Visual Inspection: 100% visual inspection before packaging to ensure no defects

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Spare Parts & Repair Kits

Part Number	Description	Application
P518835	Repair Kit — 1″, 1½″, 2″ sizes	Standard field repair kit for 1″ to 2″ dart check valves; includes seal, bushing, and hardware
P518834	Elastomer Set — 1″, 1½″, 2″ sizes	Replacement elastomer seal set for N₂/CO₂ service; explosive decompression resistant compound
P519874	Repair Kit — 3″ size	Standard field repair kit for 3″ dart check valve; includes seal, bushing, and hardware
P519873	Elastomer Set — 3″ size	Replacement elastomer seal set for 3″ valve; explosive decompression resistant compound

All repair kits and elastomer sets are factory-tested and include genuine OEM-quality components. Contact CAMTOP for kit availability and pricing.

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Frequently Asked Questions (FAQ)

Q: What is explosive decompression and why does it matter for check valves?
A: Explosive decompression (ED) occurs when high-pressure gas rapidly permeates into elastomer seals, then rapidly decompresses — causing the seal to blister, crack, or fail. CAMTOP Dart Check Valves use ED-resistant materials and design to prevent seal failure in nitrogen and CO₂ service, ensuring long service life and reliable performance.

Q: What gas velocities can these valves handle?
A: CAMTOP Dart Check Valves are rated for gas velocities exceeding 250 feet per second (76 m/s) in nitrogen and carbon dioxide service. The stainless steel internal components and special elastomer seal are specifically selected for high-velocity gas applications.

Q: What is the difference between Standard Flow and Reverse Flow configurations?
A: Standard Flow allows flow in the normal direction (from inlet to outlet) and prevents backflow. Reverse Flow is configured for flow in the opposite direction. The correct orientation depends on your piping layout — consult your system engineer or contact CAMTOP for guidance.

Q: Why is the main seal located on the seat instead of the dart?
A: Locating the seal on the seat reduces exposure to high-velocity flow erosion, which is the primary cause of seal degradation. This design allows the seal to be replaced independently without replacing the more expensive seat or dart — significantly reducing maintenance costs and downtime.

Q: What is the advantage of the low-inertia dart design?
A: The hollow dart and fixed stem minimize the pressure differential required to initiate forward flow. This reduces opening lag, minimizes pressure drop across the valve, and the non-metallic bushing reduces friction — all contributing to extended dart and stem service life.

Q: Are these valves suitable for sour gas (H₂S) applications?
A: The standard configuration is optimized for nitrogen and CO₂ service. For sour gas (H₂S) applications, contact CAMTOP for NACE MR-01-75 compliant material options and specialized elastomer recommendations.

Q: What is the standard lead time for delivery?
A: Standard lead time is 4–6 weeks for stocked sizes. Custom configurations or large volume orders may require 8–12 weeks. Contact us for current stock status and urgent delivery options.

Q: How do I select the correct size for my application?
A: Consider three factors: 1) Nominal pipe size (1″/1½″/2″/3″), 2) Maximum working pressure (15,000 PSI), 3) Flow direction (Standard or Reverse). For gas velocity applications, ensure your operating velocity does not exceed 250 ft/s. Contact CAMTOP sales for sizing assistance.

Q: What maintenance is required for dart check valves?
A: The main seal on the seat can be replaced independently without removing the seat or dart. We recommend inspecting the seal during routine maintenance intervals and replacing the elastomer set (P518834 or P519873) when wear is detected. Keep repair kits (P518835 or P519874) on-site for fast turnaround.

Q: Do you offer custom sizes or configurations?
A: Yes. In addition to the standard 1″–3″ sizes, we can manufacture custom configurations including special end connections, non-standard pressure ratings, and application-specific material upgrades. Submit your requirements for a quotation.

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Why Choose CAMTOP

• Factory Direct Pricing: No distributor markup — direct from manufacturer to your well site
• Explosive Decompression Expertise: Specialized ED-resistant materials and design for nitrogen and CO₂ service
• High-Velocity Gas Capability: Rated for gas velocities exceeding 250 ft/s in aggressive gas environments
• Low-Cost Maintenance: Seat-mounted seal design enables independent seal replacement without replacing seat or dart
• Low-Inertia Design: Hollow dart minimizes pressure drop and opening lag, improving system efficiency
• Full Size Range: 1″, 1½″, 2″, and 3″ sizes with standard and reverse flow options
• Global Shipping: Reliable delivery to major oilfield regions worldwide, including Middle East, North America, and Southeast Asia
• Technical Support: Experienced engineering team available for valve selection, installation guidance, and after-sales support

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