DFP14 NRS Gate Valve
Devinsan offers durable, space-efficient isolation solutions engineered for reliable, resilient-seated shut-off and minimal structural intrusion in critical fire and utility lines. Designed for long operational life and secure underground deployment, these DFP14 NRS Gate Valve units utilize a non-rising stem mechanism to meet the critical demands of modern municipal and industrial piping systems.
Production Standard
Nominal Dimension (DN)
Nominal Pressure (PN)
Operating Temperature
Design
Face to Face
Connection
Coating
Testing
DN 40 – DN 800
PN 6-PN 10-PN 16-PN 25-PN 40
-30° / +200°
EN 1171 – EN 1074
EN 558 Series 14 – DIN 3202 F4
EN 1092-2 ISO7005-2 Flanged
Electrostatic Powder Epoxy
EN 12266-1
Application Areas
The DFP14 NRS Gate Valve is widely used across diverse industrial and commercial sectors, delivering reliable flow control and long‑lasting performance.
1. Water and Wastewater Systems
2. Chemical Industry
3. Food and Beverage Industry
4. Pharmaceutical Industry
5. Oil and Gas Industry
6. HVAC (Heating, Ventilation, Air Conditioning) Systems
In these applications, this type DFP14 NRS Gate Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DFP14 NRS Gate Valve is a high-performance isolation valve specifically engineered to provide zero-leak shut-off in fire protection systems and municipal water mains. Designed to meet the stringent demands of modern infrastructure, this specialized valve ensures reliable sealing integrity, outstanding durability, and operational precision, particularly in installations where overhead clearance is limited or the valve is buried.
At the core of the DFP14 NRS Gate Valve is its non-rising stem (NRS) design, where the stem remains stationary in the vertical direction regardless of the gate position. This compact configuration is critical for buried service as it eliminates the need for a tall stuffing box and simplifies the design of valve boxes and operating mechanisms. The fully encapsulated resilient wedge provides a bubble-tight, leak-free seal when fully closed, ensuring positive isolation.
Manufactured from high-strength, corrosion-resistant materials and built with a robust, heavy-duty body, the DFP14 NRS Gate Valve is designed to withstand continuous system pressure and demanding environments. Its flange connections allow for secure integration into rigid pipeline sections. The compact nature of the NRS design significantly reduces the excavation depth required for installation and minimizes the potential for damage in buried applications.
The DFP14 NRS Gate Valve is ideally suited for applications in underground water distribution networks, fire system manifolds (where space is limited), and any situation requiring a permanent, reliable isolation point accessed via a T-key or actuator. Its compact profile and dependable sealing make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for long-term critical isolation and system maintenance.
In summary, the DFP14 NRS Gate Valve offers an optimal combination of reliable sealing performance, space-saving design, and enhanced security for underground service. With its resilient wedge seating, durable construction, and non-rising stem feature, this unit stands as a trusted solution for modern fluid control and isolation requirements worldwide.
1. General Information
The DFP14 NRS Gate Valve is designed for on/off service requiring tight sealing and minimal installation depth due to the non-rising stem. Proper installation is essential to guarantee safe operation, long service life, and efficient isolation capability.
2. Safety Precautions
Installation must be performed by qualified personnel only.
Ensure strict compliance with all local safety regulations and standards concerning working with pressurized water lines and heavy component lifting.
Wear appropriate personal protective equipment (PPE).
Confirm that the pipeline section is fully depressurized and isolated before attempting to install the DFP14 NRS Gate Valve.
3. Pre-Installation Checklist
Inspect the DFP14 NRS Gate Valve for any visible damage during transport or storage, paying attention to the flange faces and operating nut integrity.
Check that the valve type, size, and pressure rating match the system requirements.
Verify that the valve interior and wedge seating area are clean and free from debris.
Confirm that the mating pipeline flanges are properly aligned (parallel and concentric) and free from burrs or sharp edges.
Ensure the necessary valve box or access pit components are available for the final burial depth.
4. Installation Procedure
Positioning: Install the DFP14 NRS Gate Valve ensuring the body is correctly oriented relative to the flow.
The valve can be installed in horizontal or vertical pipelines, with the operating nut easily accessible from the surface via an extension spindle or valve key.
Use the appropriate gaskets suitable for the medium and operating conditions.
Align the valve precisely between the pipeline flanges and insert bolts, tightening them gradually and crosswise in incremental steps.
Do not exceed the specified torque to prevent damage to the valve body.
5. Post-Installation
Slowly reintroduce fluid and pressurize the system, checking immediately for leaks around the flange connections and the stem packing area.
If leakage is detected, depressurize the system immediately and re-tighten the bolts following the cross-pattern sequence.
Verify the operating nut turns smoothly and the gate opens and closes correctly.
Record the installation details, depth of burial, and final bolt torques for documentation purposes.
Proper maintenance extends the service life of the DFP14 NRS Gate Valve and ensures reliable shut-off integrity and smooth operation. Follow the guidelines below to maximize the longevity of this essential unit.
1. Routine Operation
Visually inspect the DFP14 NRS Gate Valve access point (valve box) regularly (e.g., quarterly) for water ingress or debris accumulation that could impede operation.
Operate the valve (full open to full closed) periodically, typically annually, to prevent the seating surfaces from sticking and to ensure full seal integrity.
2. Inspection Schedule
Monthly, check the valve box area for signs of water leakage, which may indicate a packing failure or flange seal leak.
Quarterly, check the ease of operation using the T-key; excessive torque required may signal debris buildup or stem binding.
Annually, perform a comprehensive internal inspection of the seating area and wedge encapsulation by isolating and partially disassembling the valve.
3. Lubrication
The operating stem threads and thrust bearings of the DFP14 NRS Gate Valve are typically housed in a sealed, lubricant-retaining chamber and may not require routine field lubrication.
Consult the manufacturer’s manual for specific lubrication requirements for the stem mechanism.
4. Seal and Gasket Replacement
Replace the stem packing immediately if external leakage is observed from the top of the operating mechanism.
The resilient wedge seal should be replaced if internal leakage (flow when closed) is detected during a pressure test.
Always isolate the valve and fully depressurize and drain the line before attempting any maintenance work.
5. Cleaning
Keep the valve operating nut and access point clean to prevent dirt and debris from being introduced into the stem mechanism during operation.
The interior body cavity is self-cleaning when operated fully open.
6. Storage and Spare Parts
Store spare parts (gaskets, operating mechanism components, extension pieces) in a dry, clean, and cool environment, away from direct sunlight and harsh chemicals.
Maintain a detailed record of all inspections, leakage tests, and repairs performed on the DFP14 NRS Gate Valve unit.
We prioritize quality at every stage of production to deliver durable, safe, and efficient products. Our continuous improvement and strict quality controls keep us at the forefront of the industry.
Our certifications prove our commitment to excellence and compliance with international standards, ensuring the safety and reliability of our products worldwide.
We continuously invest in innovation and quality to expand our certifications and meet evolving industry needs.
Frequently Asked Questions about the DFP14?
What are the main advantages of this valve?
The DFP14 NRS Gate Valve offers the space-saving benefit of the non-rising stem, making it ideal for tight spaces or buried applications, combined with the low-torque, bubble-tight sealing reliability of a resilient-seated gate valve.
Why should I choose this product?
This valve delivers outstanding performance in both sealing and durability, making it a dependable choice for demanding applications. Its straightforward design facilitates easy installation, offering flexibility during system design. With a wide range of material options, it meets the needs of various infrastructure projects, from municipal water networks to industrial facilities.
Why is the non-rising stem design preferred for underground service?
The non-rising stem design means the stem does not extend vertically when the valve is opened. This significantly reduces the size of the required valve box or access pit, simplifying installation and reducing the risk of stem damage.
How is the open/closed position of the DFP14 NRS Gate Valve determined if the stem does not move?
The position is determined by counting the number of turns of the operating nut or by utilizing a position indicator, though for buried service, operation relies solely on tracking the turns from the fully closed position (which is essential for fire service valves).
Is the DFP14 NRS Gate Valve suitable for use in waste water?
Yes. Like most resilient-seated gate valves, the DFP14 NRS Gate Valve features a smooth, unobstructed internal flow path when fully open, making it suitable for clean and some lightly suspended media, preventing debris from accumulating in the bottom of the body cavity.
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