UL/FM 200PSI Resilient Wedge OS&Y Gate Valve - Flanged x Grooved End Z481

Date Updated: July 20, 2026 Prepared by: Fire Gate Valve Technical Department

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Gate Valve

Compliance Credentials: Strictly certified to UL 260 and FM standards for high-hazard critical infrastructure

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UL/FM 200PSI Resilient Wedge OS&Y Gate Valve - Flanged x Grooved End Z481

▏Product Description

As a premier UL/FM gate valve manufacturer, Ningjin APC Industries delivers high-performance fire protection solutions. Conforming to ANSI / AWWA C515 and ASME B16.10 standards, our resilient wedge gate valves operate safely under 200 PSI working pressure (400 PSI testing pressure) and temperatures up to 80°C / 176°F. They are widely applied in building fire suppression, industrial pipelines, and potable water systems.

Constructed with premium ductile iron (ASTM A536 Grade 65-45-12) for the body, bonnet, and disc, these valves outperform standard cast iron. For smart system integration, our Outside Screw & Yoke (OS&Y) stems are pre-grooved for tamper switches, while the Non-Rising Stem (NRS) versions include operating nuts compatible with vertical or wall-type indicator posts.

Featuring a straight-through, debris-free bottom design and a pressure-responsive self-sealing bonnet, our valves ensure smooth flow and reliable sealing. Each valve is proven by a 5,000-cycle resilient seat test to guarantee an extended, maintenance-free service life.

See below for full technical features, raw materials (C95400, EPDM, SS304, Steel 1045), and Size Range: 2" to 12" dimensions for ASME/ANSI B16.1 Cl125, ASME/ANSI B16.42 Cl150, BS EN 1092-2 PN16, and GB/T9113.1 flanges.

▏Technical Features

Features Item	Technical Specification
Flange Standard	ASME/ANSI B 16.1 Class 125 ASME/ANSI B 16.42 Class 150 BS EN 1092-2 PN 16 GB / T9113.1
Groove standard	ANSI / AWWA C606 or Metric
Face to Face Standard	ASME B16.10
Sizes	2", 2.5", 3", 4", 5", 6", 8", 10", 12"(FM UL)
Approvals	FM, UL, CUL, NSF / ANSI 61 & NSF / ANSI 372
Maximum Working Pressure	200 PSI
Maximum Testing Pressure	400 PSI
Pressure conforms to	FM 1120 / 1130, UL 262, ULC / ORD C262-92
Working Temperature Range	0~80°C / 32~176°F
Coating Details	Epoxy or Coating upon request
Other Feature	NPT plug on body with 2 operating nuts
Other Feature	Certified lead-free by NSF / ANSI 61 & NSF / ANSI 372 is available

▏Valve Material List

NO.	Name	Material	Standard
1	Body	Ductile Iron	ASTM A536 Grade 65-45-12
2	Disc	Ductile Iron +EPDM	ASTM A536 Grade 65-45-12, ASTM D2000
3	Connecting Part	C95400	ASTM B148
4	Sealing Pad	EPDM	ASTM D2000
5	Stem	Stainless Steel 304	ASTM A276
6	Yoke	Ductile Iron	ASTM A536 Grade 65-45-12
7	Bolt	Steel 1045	ASTM A29
8	Gland	Ductile Iron	ASTM A536 Grade 65-45-12
9	Nut	Steel 1045	ASTM A29
10	Rotating Nut	C95400	ASTM B148
11	Handwheel	Steel 1045	ASTM A29
12	Lock Nut	Steel 1045	ASTM A29
13	Countersunk Head Bolt	Steel 1045	ASTM A29
14	Cylinder Pin	Stainless Steel 304	ASTM A276
15	Plug	C95400	ASTM B148

▏Dimensions

Size	L	H	øD	øD1	øE	F	G
2"	178	313	152	60.3	57.2	15.9	7.9
2½"	190	340	178	76.1	72.3	15.9	7.9
3"	203	387	191	88.9	84.9	15.9	7.9
4"	229	440	229	114.3	110.1	15.9	9.5
5"	254	546	254	141.3	137	15.9	9.5
6"	267	607	279	168.3	163.9	15.9	9.5
8"	292	786	343	219.1	214.4	19	11.1
10"	330	946	406	273	268.3	19	12.7
12"	356	1110	483	323.9	318.3	19	12.7

▏FAQ

📌Q1: Which UL/FM resilient wedge gate valve is recommended for a high-rising building fire fighting system that requires electrical monitoring?

A1: For high-rising building fire fighting systems requiring electrical monitoring, the APC OS&Y (Outside Screw and Yoke) Resilient Wedge Gate Valve is the industry-standard choice. Conforming strictly to ANSI / AWWA C515 standards, this heavy-duty valve features an excellent Ductile Iron structure (including the body, bonnet, disc, and gland) to guarantee superior strength-to-weight ratios and exceptional high-pressure safety. To seamlessly support your fire alarm system, all APC OS&Y gate valves are engineered with tamper-resistant handwheel nuts and pre-grooved stems enabling seamless tamper switch installation. This ensures real-time valve status tracking while delivering reliable fire protection with official UL, cUL, and FM approvals.

📌Q2: How does the bottom design of a fire protection gate valve prevent sealing failure caused by foreign matter accumulation?

A2: Traditional gate valves often suffer from internal leakage due to debris settling in the bottom recess. To solve this engineering pain point, the APC fire protection gate valve utilizes an advanced straight-through design at the bottom of the valve. This ensures that no foreign matter stores to make sure smooth flow and reliable sealing even during turbulent fire system testing. Furthermore, its stable sealing capability is backed by a rigorous resilient seat cycling test of at least 5000 times, ensuring an ultra-long service life and zero-leakage performance under extreme conditions.

📌Q3: What is the maximum working temperature and pressure sealing mechanism for a lead-free fire main waterline valve?

A3: For potable water and fire inflow water systems, the APC resilient wedge gate valve supports a maximum working temperature of 80°C / 176°F. It is fully NSF/ANSI 61 & NSF/ANSI 372 Certified lead-free, making it perfectly safe for both outdoor/indoor fire lines and drinking water networks. Mechanically, it features an intelligent self-sealing design between the bonnet and body, which automatically makes the sealing tighter when system pressure rises within the allowable range. To prevent corrosion and contamination, the entire valve receives a premium epoxy coated interior and exterior by Electrostatic Spray.

📌Q4: Can an NRS (Non-Rising Stem) fire gate valve be integrated with mechanical indicator posts for underground or wall-mounted layouts?

A4: Yes, absolutely. For buried pipelines or specialized industrial layouts where space is restricted, the APC NRS resilient wedge gate valve provides perfect compatibility with mechanical indicators. All APC NRS gate valves are available with an operated nut installed with vertical indicator post and wall type indicator systems. This allows operators to easily check the valve's open/close status from a distance. The valve body and operating nut are constructed from high-strength ductile iron material, making it highly resistant to underground mechanical stress in an industrial factory building fire protection system.

📌Q5: How does the stem sealing structure of an AWWA C515 gate valve protect operators during online maintenance?

A5: Safety during pipeline servicing is crucial. The APC ANSI / AWWA C515 gate valve integrates a multiple O-ring sealing structure to protect the stem under pressure during operation and maintenance. This multi-layered barrier allows for secure packing protection and ensures it causes no damage to the operator while handling live fire water lines. Coupled with its premium ductile iron metallurgy and stable resilient seat, this design provides a low-maintenance, high-safety solution for any commercial or industrial fire protection mainline.

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