304/304L Stainless Steel Gate Valves

Good Corrosion Resistance: Excellent resistance to oxidation and corrosion in fresh water, mild chemical media, and atmospheric conditions. The 304L grade provides additional protection against intergranular corrosion after welding.

Cost-Effective Solution: Lower alloy content (no molybdenum) compared to 316/316L makes 304/304L a more economical choice for applications where chloride-induced pitting is not a concern.

Full Port (Full Bore): Provides minimal pressure drop and allows pigging operations when fully open.

Rising Stem (OS&Y) Design: External stem threads provide visual indication of valve position (open/closed) and prevent stem thread contamination.

Non-Rising Stem (NRS) Option: For limited vertical space applications such as underground water boxes.

Backseating Capability: Full backseating allows stem seal replacement under pressure when valve is fully open.

Multiple Wedge Types: Solid wedge for general service, flexible wedge for thermal cycling applications.

Multiple End Connections: Flanged (ASME B16.5), threaded (NPT/BSP), socket weld (SW), and butt weld (BW).

Full Range of Types: OS&Y rising stem (1/2″–24″), NRS non-rising stem (2″–24″), flanged (1/2″–24″), threaded (1/2″–4″).

Pressure Ratings: Available in Class 150, 300, and 600 (PN16 to PN100).

Temperature Range: Suitable for -29°C to 200°C (-20°F to 392°F) for standard service; 304L for welded applications up to 425°C.

International Certifications: Valves can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with API 600, API 6D, ASME B16.34, and AWWA C509/C515 standards.

Raw Material Selection: High-quality 304/304L stainless steel (CF8 cast or forged) from certified mills.

Casting/Forging: Valve body and bonnet cast or forged to shape.

Heat Treatment: Solution annealing at 1010–1080°C followed by water quenching.

Machining: CNC machining of body, bonnet, wedge, stem, and seat rings.

Wedge Machining: Wedge seating surfaces machined to precise dimensions.

Stem Machining: Stem threads, backseat, and packing groove machining.

Assembly: Body, seat rings, wedge, stem, bonnet, packing, and gasket assembly.

Testing: Hydrostatic shell test, seat test (high and low pressure), backseat test.

Marking: Laser engraved with size, pressure, material, heat number, and standard.

Painting/Coating: External coating (epoxy) for corrosion protection.

Pressure Testing: Shell test (1.5× design pressure), seat test (1.1× design pressure high pressure, 80 psi low pressure air bubble test), backseat test.

Material Verification: PMI for body, bonnet, wedge, stem.

Dimensional Inspection: Face-to-face, flange drilling, stem thread gauge.

Leakage Testing: API 598 / ISO 5208 – Rate A (zero detectable leakage for soft seat).

Third-Party Inspection: SGS, BV, DNV, LR, TUV on customer request.

Water Treatment: Potable water distribution, wastewater treatment, filtration systems, reverse osmosis feed.

Food & Beverage: Clean water supply, CIP systems, dairy processing, brewery utilities.

Pharmaceutical: Clean steam systems, WFI distribution, utility water.

HVAC & Refrigeration: Chilled water, condenser water, cooling tower isolation.

Irrigation: Agricultural water supply, sprinkler systems, pump station isolation.

Fire Protection: Fire water main isolation, sprinkler system control valves.

General Industrial: Compressed air, inert gas, low-pressure steam, cooling water.

Marine (Fresh Water): Shipboard fresh water systems, accommodation water supply.

Building Services: Plumbing, heating systems, domestic water control.

Power Generation (Auxiliary): Cooling water, auxiliary systems, service water.

1. What is the difference between OS&Y and NRS gate valves?
OS&Y (Outside Stem and Yoke) has rising stem indicating valve position – threads outside the flow medium. NRS (Non-Rising Stem) has stem threads inside the valve – used where vertical space is limited such as underground water boxes.

2. What is the difference between 304 and 304L gate valves for water service?
304L has lower carbon (≤0.03%), preventing carbide precipitation during welding. For welded end valves, 304L is preferred. For threaded or flanged connections, both are suitable.

3. Can 304 gate valves be used for seawater?
No. For seawater or marine applications, use 316/316L or duplex stainless steel gate valves.

4. What is the maximum temperature for 304L gate valves?
Continuous service: 200°C (392°F) for standard service. For higher temperatures, consider 304H or alloy steel.

5. What is the difference between solid wedge and flexible wedge?
Solid wedge is one-piece, simple and cost-effective. Flexible wedge has slots to accommodate thermal expansion, preventing binding in high-temperature service or thermal cycling.

6. Are these gate valves suitable for throttling service?
Gate valves are not recommended for throttling. Partial opening causes seat and wedge erosion. For flow regulation, use globe valves or butterfly valves.

Cost-Effective: Most economical stainless steel gate valve for water and general service.

Complete Product Range: OS&Y, NRS, resilient wedge, threaded – all types available.

Large Inventory: Ready stock of common sizes 1/2″–12″ Class 150.

100% Pressure Tested: Hydrostatic shell and seat tests on every valve.

Full Traceability: Heat number on body – traceable to raw material.

Flexible Customization: Extended stem, locking device, gear operator, actuation.

AWWA Compliant: Resilient wedge gate valves for water distribution.

Global Delivery: Exported to over 50 countries.

For inquiries, technical support, or to request a quotation for your industrial valve requirements (gate, globe, check, ball, butterfly valves, etc.), please contact us:

Website: www.womicstainless.com
E‑mail: info@womicstainless.com
Tel / WhatsApp / WeChat:

Victor: +86 15575100681

Jack: +86 18390957568

Womic Steel Valves – Your reliable partner for high-quality industrial valves, custom solutions for flow control, and corrosion‑resistant applications.

Stock Examples (Flanged 304L Gate Valves – Class 150 – OS&Y – Solid Wedge – Water Service):

Stock Examples (Threaded 304L Gate Valves – Class 150 – NPT – General Service):

Stock Examples (AWWA Resilient Wedge Gate Valves – Class 150 – Flanged – Water Distribution):

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