DFP15 OS&Y Rising Stem Gate Valve
Devinsan offers visual verification isolation solutions engineered for immediate status confirmation and resilient-seated shut-off in critical fire protection and life safety systems. Designed for reliable operational integrity and easy inspection, these DFP15 OS&Y Rising Stem Gate Valve units utilize an exposed rising stem to meet the crucial demands of modern industrial and building fluid networks.
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 DFP15 OS&Y Rising Stem 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 DFP15 OS&Y Rising Stem Gate Valve ensures precise fluid control, maintains excellent sealing integrity, and supports efficient, safe operation even under demanding conditions.
The DFP15 OS&Y Rising Stem Gate Valve is a high-performance isolation valve specifically engineered to provide zero-leak shut-off and clear visual indication of its operational status, which is vital for fire and safety systems. Designed to meet the stringent demands of modern infrastructure, this valve ensures reliable sealing integrity, outstanding durability, and operational precision, particularly in environments where rapid and certain verification of the valve position is required.
At the core of the DFP15 OS&Y Rising Stem Gate Valve is its Outside Stem and Yoke (OS&Y) design. When the valve is opened, the stem visibly extends (rises) above the handwheel, providing instant physical confirmation that the valve is fully open and the system is ready for flow. Conversely, when the valve is closed, the stem retracts. This feature is crucial for rapid visual inspection in compliance with fire safety codes.
Manufactured from high-strength, corrosion-resistant materials and built with a robust, heavy-duty body, the DFP15 OS&Y Rising Stem Gate Valve is designed to withstand continuous system pressure and demanding environments. The fully encapsulated resilient wedge provides a bubble-tight, leak-free seal when fully closed. Its flanged connections allow for secure integration into rigid pipeline sections, ensuring the entire assembly maintains structural integrity.
The DFP15 OS&Y Rising Stem Gate Valve is ideally suited for applications in fire suppression system risers, pump discharge headers, and any visible installation requiring isolation capability where the “Open” status must be immediately verifiable by auditors or maintenance personnel. Its clear status indication and dependable sealing make it a preferred choice for engineers seeking a high-integrity, standards-compliant solution for long-term safety assurance.
In summary, the DFP15 OS&Y Rising Stem Gate Valve offers an optimal combination of reliable sealing performance, visible open/closed status, and compliance with life safety verification requirements. With its rising stem feature, resilient wedge seating, and durable OS&Y construction, this unit stands as a trusted solution for modern fluid control and safety integrity requirements worldwide.
1. General Information
The DFP15 OS&Y Rising Stem Gate Valve is designed for on/off service requiring tight sealing and clear visual confirmation of the open position. 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 fire protection systems 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 DFP15 OS&Y Rising Stem Gate Valve.
3. Pre-Installation Checklist
Inspect the DFP15 OS&Y Rising Stem Gate Valve for any visible damage during transport or storage, paying attention to the flange faces and yoke assembly.
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 sufficient overhead clearance is available to accommodate the full rise of the operating stem when the valve is in the fully open position.
4. Installation Procedure
Positioning: Install the DFP15 OS&Y Rising Stem Gate Valve ensuring the body is correctly oriented relative to the flow.
The valve must be installed with the stem housing vertical to ensure proper operation of the rising stem.
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 stem extends fully when open and retracts fully when closed, confirming the visible status indicator functions correctly.
Record the installation details, stem travel range, and final bolt torques for documentation purposes.
Proper maintenance extends the service life of the DFP15 OS&Y Rising Stem Gate Valve and ensures reliable shut-off integrity and clear status indication. Follow the guidelines below to maximize the longevity of this essential unit.
1. Routine Operation
Visually inspect the DFP15 OS&Y Rising Stem Gate Valve exterior regularly (e.g., quarterly) for signs of external leakage, particularly at the stem packing area and yoke assembly.
Operate the valve (full open to full closed) periodically, typically annually, to ensure the stem threads are clean and the valve seats smoothly.
2. Inspection Schedule
Monthly, check the area surrounding the valve for any signs of external leakage.
Quarterly, check the visual integrity of the rising stem for corrosion or damage, ensuring the stem packing gland is secure.
Annually, perform a comprehensive internal inspection of the seating area and wedge encapsulation by isolating and partially disassembling the valve.
3. Lubrication
The exposed operating stem threads and thrust bearings of the DFP15 OS&Y Rising Stem Gate Valve require periodic lubrication (greasing) to ensure smooth, low-torque operation and prevent corrosion on the threads.
Use only approved, high-temperature, water-resistant lubricant.
4. Seal and Gasket Replacement
Replace the stem packing and bonnet gasket immediately if external leakage is observed when the valve is pressurized.
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 exposed threads and yoke area of the DFP15 OS&Y Rising Stem Gate Valve clean to prevent dust or dirt from accumulating on the threads, which would increase operating torque and wear.
The internal body cavity is generally self-cleaning when operated fully open.
6. Storage and Spare Parts
Store spare parts (gaskets, stems, packing sets) 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 DFP15 OS&Y Rising Stem 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 DFP15?
What are the main advantages of this valve?
The DFP15 OS&Y Rising Stem Gate Valve provides reliable, bubble-tight sealing with the critical benefit of an immediately visible stem position, ensuring fire safety compliance and quick verification that the valve is fully open for water flow.
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.
What does "OS&Y" stand for, and why is it important for fire systems?
“OS&Y” stands for Outside Screw and Yoke. It is important because the exposed stem provides a clear, physical indication that the DFP15 OS&Y Rising Stem Gate Valve is open or closed, which is mandatory for fire system components accessible to inspection agencies.
Where should the DFP15 OS&Y Rising Stem Gate Valve typically be installed?
It is typically installed on the main system riser, pump discharge headers, and any accessible area where fire codes require the valve’s operational status (open/closed) to be visible from a distance for inspection.
How is the internal mechanism of the DFP15 OS&Y Rising Stem Gate Valve protected from the elements?
While the stem is exposed, the operating screw threads are kept outside the fluid stream, and the threads themselves are protected from the atmosphere by the packing gland and yoke, ensuring the moving parts remain clean and easy to operate.
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