Specification

DN15~DN600 PN16 Ductile Iron Resilient Seated Flange Gate Valve

I. Product Overview

TIANYU resilient seated flange gate valve is a robust flow control solution engineered for water supply, industrial pipelines, and medium-pressure systems. Crafted with ductile iron, WCB carbon steel, or stainless steel (CF8M), it features a resilient seated design and flange connection to ensure reliable shut-off and flow regulation. Compliant with API 600, API 6D, and ANSI standards, it operates across -46℃~550℃ (depending on material) and handles water, oil, steam, and mild corrosive media. With a full-port design and outside screw & yoke (OS&Y) structure, it balances sealing performance, durability, and ease of maintenance—ideal for municipal water supply, petrochemical, and power generation industries where stable flow control is critical.

Design Spec.	Face to Face	Flange End	Test & Check	Pressure-Temp	Marking	Supply
API600	ANSFB16.10	ANSI B16.5	API598	ANSI B16.34	API6D	API600
API6D	API6D	ANSI B16.5	API6D	ANSI B16.34	API6D	MSS SP-25

Part Name	Part Material
Body/Bonnet	A216-WCB	A217-WC6	A352-LCB	A351-CF8M
Wedge	A216-WCB	A217-WC6	A352-LCB	A351-CF8M
Stem	A182-F6a	A182-F11	A182-F6a	A182-F316
Packing	Flexible Graphite			PTFE
Gasket	18-8Flexibie Graphite
Bolt	A193-B7	A193-B7	A193-B7M	A193-B8
Suitable Temp.	-29~425℃	-29~550℃	-46~350℃	-40~200℃
Suitable Medium	Water,Oil,Steam	Steam,Oil	Steam,Oil	Nitric Acid

NPS	DN	Ciass 150Lb
in	mm	L	D	D1	D2	b	z-Φd	H	Do
	Z40H-150Lb (Body:WCB)	Z40W-150LbP (Body:CF8)		Z40Y-150LьP (Body:CF8)	Z40Y-150LbR (Body:CF8M)	Z40Y-150LbR (Body:CF8M)	Z40Y-150LbRLS（Body:CF3M）
1/2”	15	108	89	60.5	35	11.5	4-Φ15	155	900
3/4”	20	117	98	70	43	11.5	4-Φ15	160	900
1”	25	127	108	79.5	51	12	4-Φ15	200	100
11/4”	32	140	117	89	64	13	4-Φ15	245	180
11/2”	40	165	127	98.5	73	15	4-Φ15	285	200
2”	50	178	152	120.5	92	16	4-Φ19	323	200
21/2”	65	190	178	139.5	105	18	4-Φ19	347	250
3”	80	203	190	152.5	127	19	4-Φ19	383	250
4”	100	229	229	190.5	157	24	8-Φ19	457	300
5”	125	254	254	216	186	24	8-Φ22	632	300
6”	150	267	279	241.5	216	26	8-Φ22	635	300
8”	200	292	343	298.5	270	29	8-Φ22	762	350
10”	250	330	406	362	324	31	12-Φ25	895	400
12”	300	356	483	432	381	32	12-Φ25	1080	500
14”	350	381	533	476	413	35	12-Φ29	1295	600
16”	400	406	597	540	470	37	16-Φ29	1435	600
18”	450	432	635	578	533	40	16-Φ32	1626	650
20”	500	457	699	635	584	43	20-Φ32	1829	650
24”	600	508	813	749.5	692	48	20-Φ35	2175	700

Product Overview

II. Key Attribute Parameters

Size Range: DN15~DN600 (1/2″~24″), covering small to large-diameter pipelines for diverse applications from residential water lines to industrial main pipelines.
Pressure Rating: PN16 (Class 150), suitable for low to medium pressure systems such as water distribution networks and steam auxiliary pipelines.
Temperature Range: Varies by material:
- WCB/CF8M: -29℃~425℃
- WC6: -29℃~550℃
- LCB: -46℃~350℃
Material Configuration:
- Body & Bonnet: Ductile iron (for water supply), WCB (carbon steel, general industrial), CF8M (stainless steel, corrosive media).
- Wedge: Elastic wedge (flexible design) matching body material, ensuring tight sealing even with pipeline misalignment.
- Stem: F6a (carbon steel), F316 (stainless steel for corrosion resistance), with rising stem design for clear position indication.
- Seal: Resilient seated (rubber/PTFE) + flexible graphite packing, achieving tight shut-off and resisting media erosion.
- Bolt & Gasket: A193-B7 bolts (high strength), 18-8 stainless steel with graphite gasket (leak-tight under pressure).
Connection Type: Flange (per ANSI B16.5, DIN, BS), enabling secure integration with pipeline flanges and easy installation.
Operation: Manual (handwheel) with optional gear operator for large-diameter valves (DN300+), reducing operating torque.

III. Features Description

Resilient Seated Elastic Wedge: The flexible wedge adapts to minor pipeline misalignment or thermal expansion, ensuring consistent contact with the valve seat. The resilient seal (rubber/PTFE) enhances shut-off performance, achieving ANSI/FCI Class IV leakage—critical for preventing water loss in municipal supply systems.
Outside Screw & Yoke (OS&Y) Structure: The stem is exposed outside the bonnet, with threads isolated from media. This design avoids stem corrosion by media, extends service life, and provides visual confirmation of valve position (open/closed) via stem extension—essential for safety in industrial pipelines.
Full-Port Design: The flow path diameter matches the pipeline, minimizing pressure drop and energy loss. This is particularly beneficial for water supply systems, where efficient flow reduces pumping costs.
Bolted Bonnet: Securely fastened with bolts, the bonnet allows easy access to internal components (wedge, packing) for maintenance. This modular design simplifies replacement of worn parts without removing the valve from the pipeline.
Material Versatility: Ductile iron for cost-effective water supply; WCB for high-temperature steam; CF8M for corrosive media like nitric acid. This range eliminates the need for multiple valve types in complex systems.

IV. Manufacturing Processes

Material Validation: Ductile iron/WCB/CF8M castings undergo ultrasonic testing to detect internal defects. Chemical analysis verifies alloy composition (e.g., CF8M’s Cr16-18%, Mo2-3%) to ensure corrosion resistance.
Wedge & Seat Machining: The elastic wedge is precision-machined to ensure flexibility within 0.5mm tolerance, allowing adaptation to pipeline changes. Seat surfaces are ground to Ra ≤1.6μm, then bonded with resilient seals (rubber/PTFE) via high-temperature adhesive.
Stem & Bonnet Assembly: The stem is threaded with precision (ISO metric threads) to ensure smooth rising/descending. The bonnet is bolted to the body with uniform torque (50-80N·m) to avoid leakage, and packing (flexible graphite) is layered to prevent stem leakage.
Testing:
- Hydrostatic Test: Body tested at 1.5×PN16 (2.4MPa) for 30 minutes; seat tested at 1.1×PN16 (1.76MPa) with water to confirm no leakage.
- Operation Test: Manual/gear operation tested for 100+ cycles to ensure smooth stem movement and no jamming.
- Material Performance Test: High-temperature (550℃ for WC6) and low-temperature (-46℃ for LCB) tests verify material toughness under extreme conditions.

Valve Details

V. Product Advantages

Reliable Sealing: Elastic wedge + resilient seat maintain tight shut-off even with pipeline vibration or thermal expansion, reducing leakage risks by 90% compared to rigid wedge valves in water supply systems.
Long Service Life: OS&Y structure protects stem threads from media corrosion; high-strength materials (WCB, CF8M) resist wear and erosion, extending service life to 15+ years in normal operation.
Efficient Flow: Full-port design minimizes pressure drop by 30% vs. reduced-port valves, lowering energy consumption in large-scale water distribution or industrial flow loops.
Easy Maintenance: Bolted bonnet and modular components allow packing replacement or wedge adjustment without pipeline disassembly, reducing maintenance downtime by 50%.
Wide Compatibility: Multiple materials and standards compliance (ANSI, DIN) enable use in municipal, industrial, and corrosive environments, enhancing versatility.

Application

VI. Application Fields

Municipal Water Supply: Controls water distribution in residential, commercial, and public pipelines, with ductile iron body and resilient seals ensuring no leakage and long service life.
Petrochemical Industry: Regulates oil and light hydrocarbon flow in refineries, leveraging WCB material’s high-temperature resistance (425℃) and OS&Y structure for safe operation.
Power Generation: Manages boiler feedwater and low-pressure steam loops, with WC6 material handling 550℃ steam and tight sealing preventing energy loss.
Heating Systems: Controls hot water and steam flow in district heating networks, where the elastic wedge adapts to thermal expansion of pipelines.
Corrosive Media Handling: CF8M models handle mild acids (e.g., nitric acid) in chemical plants, with stainless steel resisting corrosion and ensuring media purity.