Relief Valve (2000#), Part No. 26DA16-140, NSN 4820-01-331-8674: Worldwide Buyer's Guide
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The Relief Valve (2000#), Part No. 26DA16-140, NSN 4820-01-331-8674 is a 2000 psi (138 bar) rated pressure relief valve that opens automatically to vent excess fluid when system pressure exceeds its set point, protecting pumps, cylinders and downstream components. It is identified by both an OEM part number and a NATO Stock Number (NSN), making it orderable through both commercial and defence supply channels.
What is a 2000# relief valve and what does it do?
A 2000# relief valve is a pressure-limiting device rated to a nominal 2000 psi (138 bar) working pressure. It is a normally-closed valve held shut by a spring or pilot pressure; when inlet pressure overcomes the spring setting, the valve lifts and diverts flow to tank or atmosphere.
In hydraulic circuits, this protects pumps, seals and actuators from pressure spikes. In industrial fluid handling, the same principle protects piping, vessels and instrumentation. Brands such as ENERPAC, VICKERS and Parker build adjustable relief valves across this pressure class, and the 26DA16-140 / NSN 4820-01-331-8674 item sits in that family.
Definition: A relief valve is an automatic, pressure-actuated safety device that opens at a preset pressure to discharge fluid and prevent overpressure damage in a hydraulic, pneumatic or process system.
How does a 2000# relief valve work?
Fluid enters the inlet port and acts on a poppet or piston. A spring opposes that force. When inlet pressure equals the spring setting, the poppet cracks open and flow passes to the outlet. When pressure falls, the spring reseats the poppet.
Adjustable versions — like the ENERPAC V152 — let technicians tune the cracking pressure across a range. Fixed versions are factory-set and tamper-resistant, which suits OEM and defence applications where the set point must not drift.
Key specifications to verify
Before ordering the 26DA16-140 or any cross-referenced equivalent, confirm the following measurable attributes. Values below reflect the 2000# class and comparable catalog items; always verify against the specific datasheet.
| Attribute | Typical value / range | Notes |
|---|---|---|
| Rated pressure | 2000 psi (138 bar) | Nominal class rating |
| Adjustable range (comparable ENERPAC V152) | 800 psi to 10,000 psi (55 bar to 690 bar) | Adjustable variant |
| Max flow rate (comparable ENERPAC V152) | 4 gpm (15 L/min) | Hydraulic service |
| Body material | Steel | Hydraulic-grade |
| Port connection | Per OEM datasheet (verify NPT / SAE) | Confirm before order |
| Operating temperature (comparable ARO pneumatic accessory) | 0°F to 180°F (-18°C to 82°C) | Pneumatic reference |
| Identification | Part No. 26DA16-140 / NSN 4820-01-331-8674 | Dual-channel ordering |
Types of relief valves and where they are used
Relief valves fall into several families, each suited to different Worldwide industrial applications:
- Direct-acting spring relief valves — simple, fast, used on hydraulic power units, presses and jacks.
- Pilot-operated relief valves — higher flow capacity, used on large hydraulic systems and process lines.
- Thermal relief valves — protect closed hydraulic loops from thermal expansion.
- Sanitary / process relief valves — food, pharma and chemical service.
- Plumbing relief assemblies — diaphragm and relief valve parts for flush valves, such as those from SLOAN, ZURN and KOHLER.
For pneumatic control circuits, relief and manifold accessories from ARO and MAXAIR consolidate and protect air lines. For hydraulic circuits at the 2000# class, ENERPAC, VICKERS and Parker are the reference brands.
How to select the right relief valve
- Confirm the pressure rating. Match the valve's rated pressure to your system's maximum working pressure with a safety margin — 2000 psi (138 bar) for the 26DA16-140 class.
- Verify the set / cracking pressure. Fixed or adjustable? Adjustable valves like the ENERPAC V152 allow field tuning from 800 psi (55 bar) upward.
- Check flow capacity. Undersized valves cause chatter and pressure spikes. Confirm gpm or L/min at your operating pressure.
- Match port size and thread standard. NPT, SAE, BSPP or metric — mismatched threads are the most common installation failure.
- Confirm fluid compatibility. Mineral oil, water-glycol, phosphate ester and air each demand different seal materials.
- Check the environment. Temperature range, corrosion exposure and vibration affect body and seal choice.
- Verify documentation. For NSN items, confirm the NSN, CAGE code and any required certification before shipment.
Product comparison: relief and diaphragm valve options in stock
The table below compares in-stock relief and diaphragm valve products from 3G Electric, arranged from light-duty plumbing service up to hydraulic overpressure protection. Use it to identify the closest match to your application.
| Product | Type | Key spec | Typical application |
|---|---|---|---|
| ENERPAC V152 Adjustable Pressure Relief Valve | Adjustable hydraulic relief | 800 psi to 10,000 psi (55–690 bar); 4 gpm (15 L/min); steel body | Industrial presses, jacks, clamping systems |
| ARO 4-Port Manifold for Manual Air Control Valves | Pneumatic manifold accessory | 4 ports; 3/8 in Female NPT; 0°F to 180°F (-18°C to 82°C) | Consolidating multiple air lines |
| SLOAN G2 Guide Assembly (6-Pack) | Diaphragm & relief valve part | 3.5 gpf rating; 6-pack | Flushometer toilet maintenance |
| AMTC VALVE Diaphragm Repair Kit | Diaphragm repair kit | Includes drop-in pin | Commercial/industrial flush valve repair |
| SLOAN Diaphragm Assembly for Urinal Flush Valves | Diaphragm & relief valve part | Includes disc; Regal® series compatible | Commercial restroom urinals |
| SLOAN Diaphragm Assembly (2.4 gpf) | Diaphragm & relief valve part | 2.4 gpf; Regal® series compatible | Commercial toilet flush valves |
| SLOAN Royal® Diaphragm Assembly (1.28 gpf) | Diaphragm & relief valve part | 1.28 gpf; includes diaphragm and relief valve components | Royal® series toilets |
| KOHLER Plastic Diaphragm Assembly (1 gpf) | Diaphragm & relief valve part | 1 gpf; includes drop-in pin | Commercial and residential toilets |
Step up the ladder when your application moves from plumbing maintenance to hydraulic overpressure protection: the ENERPAC V152 covers the widest pressure range and is the correct choice for presses, jacks and clamping circuits. For flush-valve maintenance, match the gpf rating and series (Regal®, Royal®, G2) to the fixture in service.
Worldwide sourcing, export and lead time
3G Electric supplies relief valves and related parts to buyers across the Worldwide market, including North America, Europe, the Middle East, Asia-Pacific and Africa. We handle export documentation, commercial invoices and packing lists, and can quote on an incoterms-neutral basis (EXW, FOB, CIF or DDP) depending on your freight preference.
Where a system runs on 50 Hz or 60 Hz power — for example, a hydraulic power unit with an electric motor — confirm the motor nameplate frequency and voltage before specifying the valve assembly. Valve ratings themselves are frequency-independent, but the pump and control circuit are not.
All pricing is quoted in USD. Lead time depends on stock status and destination; contact us for a current quote.
Why source from 3G Electric
3G Electric stocks 143 products across related categories and brings 35+ years of industrial supply experience to every enquiry. We interpret your demand — part number, NSN, or a description of the failure — and deliver the right genuine industrial equipment, part or supply.
Our specialist depth in combustion, pumps and controls means we understand fluid-handling systems end to end, not just the valve on the shelf. We supply across 14 industrial departments and far more than is listed online. When you need a 2000# relief valve, a diaphragm assembly or a cross-referenced equivalent, we get the right answer — not an infinite warehouse claim.
Frequently asked questions
What is the Relief Valve (2000#), Part No. 26DA16-140, NSN 4820-01-331-8674 used for?
It is a 2000 psi (138 bar) rated pressure relief valve used to protect hydraulic and industrial fluid circuits from overpressure. It opens automatically when system pressure exceeds its set point, diverting flow to tank or atmosphere to protect pumps, cylinders and downstream components.
How do I cross-reference NSN 4820-01-331-8674 to a commercial part?
Start with the NSN's 4820 Federal Supply Class (valves and fittings), then match the OEM part number 26DA16-140 against the manufacturer's catalog. Confirm pressure rating, port size, flow capacity and fluid compatibility before accepting any cross-reference.
Can I buy a 2000# relief valve in Worldwide with export documentation?
Yes. 3G Electric supplies worldwide and prepares commercial invoices, packing lists and export documentation. We can quote EXW, FOB, CIF or DDP. Lead time depends on stock status and destination — contact us for a current quote in USD.
What is the difference between an adjustable and a fixed relief valve?
An adjustable relief valve — such as the ENERPAC V152, adjustable from 800 psi to 10,000 psi (55–690 bar) — lets technicians tune the cracking pressure in the field. A fixed valve is factory-set and tamper-resistant, which suits OEM and defence applications where the set point must not drift.
How do I size a relief valve for my hydraulic system?
Match the rated pressure to your maximum working pressure with a safety margin, confirm flow capacity in gpm or L/min at operating pressure, and verify port size and thread standard. Undersized valves cause chatter and pressure spikes; oversized valves may not open promptly.
Do you supply relief valve parts for flush valves as well as hydraulic relief valves?
Yes. 3G Electric stocks diaphragm and relief valve parts for flush valves from SLOAN, AMTC VALVE and KOHLER, alongside hydraulic relief valves from ENERPAC. Match the gpf rating and series (Regal®, Royal®, G2) to the fixture in service.
Key takeaways
- The 26DA16-140 / NSN 4820-01-331-8674 is a 2000 psi (138 bar) rated relief valve for hydraulic and industrial fluid circuits.
- Verify pressure rating, cracking pressure, flow capacity, port size and fluid compatibility before ordering.
- ENERPAC, VICKERS and Parker are reference brands in the 2000# hydraulic relief class; SLOAN, ZURN and KOHLER cover plumbing relief assemblies.
- 3G Electric supplies worldwide with export documentation and USD pricing.
- Contact 3G Electric for quotes, sizing assistance and technical support.
Ready to order? Contact 3G Electric for a quote on the Relief Valve (2000#), Part No. 26DA16-140, NSN 4820-01-331-8674, or for sizing assistance on a cross-referenced equivalent. Our technical team supports Worldwide buyers with specification review, export documentation and delivery scheduling.
