Description

Weco Top Entry Check Valves

Extended Life 2″–4″ | 15,000 PSI CWP | Standard & Sour Gas Service | 1902/1905/602 Hammer Union

---

CAMTOP Weco® top entry check valves are engineered with proprietary materials and advanced structural design to deliver extended valve life — 2–3 times in acid service or 4–5 times in standard service. The redesigned hammer union style body cap enables fast, tool-free field service, eliminating the need for special tools and reducing non-productive downtime. Ideal for high-pressure well servicing lines, fracturing lines, cementing, circulating, and stimulation applications.

---

Product Image

CAMTOP Weco Top Entry Check Valve — 3″ 15K Extended Life, hammer union style body cap with lifting eye

---

Key Features

• Extended Life Design: Proprietary materials and structural redesign deliver 2–3X life in acid service or 4–5X in standard service
• Tool-Free Field Service: Hammer union style body cap detaches easily — no special tools required, reducing downtime and maintenance costs
• Pin Retainer System: Patent-pending pivot pin retainer improves wear resistance, enhances body cavity sealing, and reduces maintenance frequency
• Multiple Sizes Available: 2″, 3″, and 4″ nominal sizes to cover a wide range of well service applications
• High Pressure Rating: Working pressures up to 15,000 PSI CWP, with 10,000 PSI and 6,000 PSI options for lower-pressure systems
• Standard & Sour Gas Service: Available in standard service and sour gas (H₂S) compliant configurations
• Multiple Flow Directions: Standard flow and reverse flow assemblies available for flexible installation
• Replaceable Components: Replaceable seat cartridges, flappers, and seal rings for economical repair
• Comprehensive Repair Kits: Three replacement kits available (Kit 1/2/3) covering flapper, pin, o-rings, body plug, and cartridge insert
• API 6A / NACE MR-01-75 Compliant: Manufactured to meet or exceed industry standards for oilfield valve applications

---

Technical Specifications

Size	CWP (PSI)	Service	End Connections	Flow	Part Number	Repair Kit	Elastomer Set
2″	15,000	Standard	1902 M/F	Standard	P55089	P528681	P528686
	15,000	Standard	1902 M/F	Reverse	P37198	P528681	P528686
	15,000	Standard	1902 M/F	Standard	P37131-LT	P528681	P528686
	10,000	Sour Gas	1902 F/M	Standard	P37196-LT	P537904	P537905
3″	15,000	Standard	1902 M/F	Standard	P558733	P561370 P561369 P561861	—
	15,000	Standard	1905 M/F	Standard	P562345	P561370 P561369 P561861	—
	15,000	Standard	1902 M/F	Reverse	P561165	P561370 P561369 P561861	—
	10,000	Sour Gas	1902 F/M	Standard	P537225	P508059	P508060
	6,000	Standard	602 P/M	Standard	P537202	P522215	P522359
	6,000	Standard	602 P/M	Reverse	P527120	P522215	P522359
4″	15,000	Standard	1902 M/F	Standard	P527460	P525441	P525505
	15,000	Standard	1902 M/F	Reverse	P527699	P525441	P525505
	10,000	Standard	1002 M/F	Standard	P528809	P525441	P525505
	6,000	Standard	1002 M/F	Reverse	P527018	P525441	P525505

Note: * Vent cap available. All dimensions in inches (mm) and weight in lb (kg). Refer to technical drawing for exact measurements.

---

Main Components

No.	Component Name	Material / Description	Function
1	Body Cap	High-strength alloy steel with hammer union profile	Provides top entry access for fast field service; no special tools required for removal
2	Pin Retainer	Patent-pending pivot design	Improves wear resistance, enhances body cavity sealing, and reduces maintenance frequency
3	Seal Ring	High-performance elastomer	Provides primary pressure seal between body cap and valve body under high-pressure conditions
4	Pivot Pin	Hardened alloy steel	Connects flapper to body for reliable pivot action during flow reversal events
5	Flapper	Proprietary composite material with enhanced erosion resistance	Primary flow control element; proprietary material extends service life 2–3X in acid, 4–5X in standard
6	Seat Cartridges	Replaceable hardened seat with elastomer seal	Provides seating surface for flapper; replaceable cartridge design enables economical repair
7	Body Plug	High-strength alloy steel	Seals bottom end of valve body and provides structural integrity under pressure

---

Assembly Drawing

Weco Top Entry Check Valve Cutaway — ① Body cap, ② Pin retainer, ③ Seal ring, ④ Pivot pin, ⑤ Flapper, ⑥ Seat cartridges, ⑦ Body plug

---

Applications

• High-Pressure Well Servicing Lines: Reliable check valve protection for well intervention and workover operations
• Fracturing Lines: Withstands abrasive proppant and high-pressure frac fluid in hydraulic fracturing operations
• Cementing Operations: Prevents backflow during primary and remedial cementing jobs
• Circulating and Stimulation Lines: Essential for acidizing, stimulation, and chemical injection applications
• Testing Lines: Ensures safe pressure testing of wellhead and surface equipment
• Sour Gas Environments: NACE-compliant materials for H₂S-containing well service applications

---

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
• Dimensional Inspection: Critical dimensions verified with CMM and precision gauges against engineering drawings
• Surface Finish Inspection: Ra surface roughness checked on all sealing surfaces
• Final Visual Inspection: 100% visual inspection before packaging to ensure no defects

---

Spare Parts & Repair Kits

Kit	Part Number	Contents	Application
Kit 1	P561370	Flapper and pin	Standard field repair — flapper replacement
Kit 2	P561369	Flapper, pin, o-rings and body plug	Extended repair — flapper + sealing components
Kit 3	P561861	Cartridge insert, pin, body plug, o-rings	Complete overhaul — cartridge + body plug

Standard Flow Assembly: Part No. P558733 (3″ 15K Standard)

Reverse Flow Assembly: Part No. P561165 (3″ 15K Reverse)

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

---

Frequently Asked Questions (FAQ)

Q: What is the difference between Standard Flow and Reverse Flow check valves?
A: Standard Flow check valves allow flow in the normal direction (from inlet to outlet) and prevent backflow. Reverse Flow check valves are configured for flow in the opposite direction. Both use the same robust flapper and seat design. The correct orientation depends on your piping layout — consult your system engineer or contact CAMTOP for guidance.

Q: What does “Extended Life” mean for Weco check valves?
A: CAMTOP Weco check valves incorporate proprietary materials and improved structural design that deliver 2–3 times longer service life in acid service environments, or 4–5 times longer in standard service conditions, compared to conventional check valves. This translates to fewer replacements, reduced downtime, and lower total cost of ownership.

Q: What end connections are available?
A: We offer 1902 M/F (Male/Female), 1905 M/F, and 602 P/M (Pipe/Male) hammer union connections. The 1902 series is the most common for 15K well service applications. Contact us if you require custom or specialty end connections.

Q: What is the maximum working pressure?
A: The 15,000 PSI CWP rating is the highest available. We also offer 10,000 PSI and 6,000 PSI options for lower-pressure systems. The correct rating depends on your specific well service application and system design.

Q: Are these valves suitable for sour gas (H₂S) applications?
A: Yes. Select models are available in Sour Gas service configuration with NACE MR-01-75 compliant materials. Look for “Sour Gas” in the Service column of the specifications table. Always specify sour gas requirements when ordering.

Q: How do I perform field maintenance on the top entry check valve?
A: The hammer union style body cap detaches easily by hand — no special tools required. This allows direct access to the hand-removable internals (flapper, seat cartridges, seal rings) for inspection, cleaning, or replacement. We recommend keeping repair kits (Kit 1/2/3) on-site for fast turnaround.

Q: What is included in the repair kits?
A: Kit 1 includes the flapper and pin for basic replacement. Kit 2 adds o-rings and body plug. Kit 3 is the most comprehensive, including cartridge insert, pin, body plug, and o-rings for a complete overhaul. All kits use genuine OEM-quality components.

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. We also maintain an inventory of fast-moving sizes for urgent requirements. Contact us for current stock status.

Q: Do you offer custom sizes or configurations?
A: Yes. In addition to the standard 2″, 3″, and 4″ 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.

Q: How do I select the correct check valve for my application?
A: Consider four key factors: 1) Nominal pipe size (2″/3″/4″), 2) Maximum working pressure (15K/10K/6K), 3) Service environment (Standard or Sour Gas), 4) Flow direction (Standard or Reverse). Contact CAMTOP sales with these details and we will recommend the correct part number and configuration.

---

Why Choose CAMTOP

• Factory Direct Pricing: No distributor markup — direct from manufacturer to your well site
• API 6A / NACE Compliant: All valves meet or exceed API 6A and NACE MR-01-75 material requirements
• Extended Life Technology: Proprietary materials deliver 2–5X longer service life, reducing total cost of ownership
• Tool-Free Maintenance: Hammer union body cap design enables fast field service without special tools
• Comprehensive Repair Kits: Three kit levels available for economical, on-site repair and maintenance
• Full Size Range: 2″, 3″, and 4″ sizes with 15K, 10K, and 6K pressure ratings
• 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

---

---