Superior Material Composition: Our valves are cast with chemical compositions at the highest end of international standards. For example, our ASTM A351 CF8 stainless steel contains 9% Nickel—the maximum allowable—to ensure superior corrosion resistance and extended service life.
Lug Hole Positional Accuracy: The true position of our threaded lug hole pattern is precisely controlled to an exacting tolerance of ±0.10 mm relative to the valve centerline.
100% Gauge Verification: To validate this precision, every valve's lug holes are 100% inspected with certified go/no-go gauges.
Premium raw steel finish with corrosion-resistant coating; deep-cast permanent markings for full traceability (material, pressure, heat number).
Design and Manufacture: ASME B16.34; ASME VIII; API 609:AS2129 JISB2220
Leakage Class: API 598 (Bi-directional Zero Leakage)
Side Flange Standards: ANSI 125LB/ 150LB; ASME; AS-D/E; BS; DIN; EN PN6/ PN10/ PN16; GB; GOST; HG/T; JIS 5K/ 10K
Top Flange (Actuator Mounting) : ISO 5211; GB 90°
Face-to-Face Dimension: ISO 5752; MSS SP-68; ASME B16.10; EN 558-1; API 609
Testing Standards: API 598; EN 12266-1; ISO 5208; BS 6755-1
Certifications: ISO 9001; CE; BV; API 609; API 598; EAC; SIL3；
Technical description
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Q&A
SPECIFICATION OF THE VALVE |
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|---|---|
|
Type of Connection |
Lug (NPT/ Through Hole Connection) |
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Actuation |
Worm Gear |
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Size |
1 1/2in ~ 48in |
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Pressure |
10bar~20bar |
|
Testing Pressure |
256psi |
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Medium |
Water, Oil, Gas, Steam, Corrosive Media, Slurry, etc. |
|
Medium Temperature |
-25℃~180℃ |
MATERIAL OF THE VALVE |
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|---|---|
|
Body |
WCB/WCC/ LCB/ LCC/ LC1 |
|
Disc |
DI/ CF8/ CF8M/ CF3/ CF3M/ 2205/ 2507/ 1.4529/ HC276/ C95400/ C95800 |
|
Stem |
45#/ SS410/ SS416/ SS420/ SS304/ SS316/ SS316L/ 17-4/ 2205/ 2507/ 1.4529/ K500/ CF8/ CF8M/ HC276 |
|
Soft Seat |
EPDM/ NBR/ SIL/ FKM/ FPM/ VITON/ PTFE/ HYPALON/ UHMWPE |
|
Coating |
Epoxy Resin 200um ~ 250um |
For over 20 years, our reputation has been built on deep material expertise and precision engineering. We control the entire process, from raw casting to final assembly, ensuring every worm gear butterfly valve meets our uncompromising standards.
Founded by a casting expert, we guarantee material integrity. We use PMI testing to verify alloys, ensuring every valve body strictly adheres to ASTM/EN standards for optimal performance and longevity.
Our state-of-the-art CNC centers ensure every component's dimensions are machined to exact specifications. This precision is critical for the perfect fit and flawless operation of the valve assembly, guaranteeing reliability.
With two decades of field validation, our valve designs are not just theoretical; they are proven to be rational and reliable. This extensive experience means our products deliver consistent, trustworthy performance.
We don't outsource quality. Our own CNC machining center gives us absolute control over the tolerance and finish of every valve component, from the valve body to the gear housing. This vertical integration is our promise of precision.
The worm gear operator provides high torque and precise, slow-speed control, making this valve ideal for large-diameter pipelines, high-pressure applications, and critical throttling services across various industries.
In large-scale petrochemical plants, precise and reliable flow control is paramount. Our butterfly valve oil and gas industry models feature a high-torque worm gear, ensuring steady, controllable throttling of chemicals and hydrocarbons, enhancing operational safety.
For massive cooling water intakes in power plants, our gear type butterfly valve offers the essential mechanical advantage to operate large-diameter valves against high pressures, ensuring dependable isolation and regulation.
Our large diameter butterfly valve with a worm gear operator is the top choice for municipal water grids. It allows for precise throttling to balance pressure across the network and provides reliable shutoff in critical pump stations.
Onboard ships, space is tight and reliability is key. Our jis butterfly valve with a worm gear actuator resists vibration and provides the slow, controlled operation needed for ballast water management and engine room cooling systems.
In the harsh environment of mining, controlling abrasive slurries requires robust equipment. This industrial butterfly valve uses a worm gear mechanism that prevents valve flutter and provides powerful, consistent actuation cycle after cycle.
For large-scale commercial HVAC and district heating, balancing flow is crucial for efficiency. The worm gear operated butterfly valve allows facility managers to precisely set and lock the valve position, ensuring optimal system performance.
Controlling the flow of thick pulp stock can demand immense torque. This heavy-duty 16in butterfly valve utilizes a powerful worm gear operator to easily manage viscous media, preventing blockages and ensuring smooth production.
When dosing aggressive chemicals, sudden valve movements can be hazardous. Our teflon lined butterfly valve, equipped with a worm gear, ensures slow, deliberate, and precise control, enhancing safety in chemical processing lines.
For silo and hopper discharge applications, our 12 inch butterfly valve with a manual gear operator gives personnel the mechanical advantage needed to precisely control the flow of powders, grains, and other bulk solids.
We combine robust worm gear actuation with advanced materials and coatings to conquer the most aggressive media, ensuring long-term reliability and safety.
In the world of district energy, when you're responsible for heating an entire city block, uptime is everything. For ThermaGrid Solutions, designing and building these critical infrastructure networks means every single component must be engineered for unwavering performance.
Not Just a Utility Contractor... An Urban Engineering Powerhouse
ThermaGrid isn't just laying pipe; they are a premier engineering firm that designs, builds, and commissions the complex, high-pressure hot water networks that form the backbone of modern urban heating systems. "We design a network to last for 50 years," says David Miller, Lead Mechanical Engineer. "Every component, from the central plant to the final valve in an underground vault, is specified and scrutinized. We build systems, not just projects."
For a new downtown network expansion, featuring large-diameter trunk lines buried in tight urban corridors, ThermaGrid needed a main isolation valve that was both structurally sound and reliably operable in confined spaces. They needed a partner who shared their obsession with long-term reliability.
What Happens When a 16-Inch Main Valve is Inoperable?
The stakes are immense. A valve in a subterranean vault must be operated for emergency shutdowns. With previous suppliers, ThermaGrid faced a cascade of technical failures. "The breakaway torque on their large valves was immense, especially after sitting static for months. Our teams were using unsafe 'cheater bars'," Miller notes. "We traced the issue to inconsistent machining in the stem-to-disc connection, creating stress points. Worse, the gearboxes would seize from humidity and condensation ingress. Being unable to isolate a line quickly is a system-wide risk we cannot tolerate."
When ThermaGrid presented their specific failure modes, we provided a solution rooted in engineering discipline and manufacturing control. The answer was not just a product, but a system of guarantees: Our A216 WCB Carbon Steel Lug Butterfly Valve with a Worm Gear Operator, engineered from the molecule up.
ThermaGrid's first concern was material robustness. We didn't just provide MTRs; we detailed our process. The raw A216 WCB castings (C ≤ 0.25%, Mn 1.20%, Si 0.60%) undergo a mandatory **normalizing heat treatment at 910°C (1670°F) for 4 hours**, followed by air cooling. This process refines the coarse, as-cast dendritic grain structure into a uniform, fine-grained ferrite-pearlite microstructure. **Why is this critical?** This refined structure eliminates internal stresses and drastically increases the material's fracture toughness and fatigue resistance, essential for withstanding the constant thermal cycling and pressure fluctuations of a district heating network.
To permanently solve the high breakaway torque, our solution lies in advanced machining. Using our 5-axis CNC centers, the valve's critical dynamic interfaces are machined to a level of precision that redefines performance. The disc edge is polished to a **surface finish of Ra < 0.8 μm**, and we maintain a **total concentricity of less than 0.05mm** between the stem bore and the seat face. **Why this matters:** This ultra-smooth, perfectly aligned interface minimizes static friction (stiction) against the EPDM seat, directly lowering the required breakaway torque by over 30% and addressing the root cause of the unsafe "cheater bar" problem.
The gearbox seizure was a classic failure of material science and sealing. Our worm gear operator is an engineered system, not an off-the-shelf part. It features a **case-hardened 4140 alloy steel worm** paired with a high-strength **C95400 aluminum bronze worm gear**. This specific material pairing is chosen for its low coefficient of friction and anti-galling properties. The assembly is lubricated with a **wide-temperature (-40°C to 150°C) synthetic grease** and fully sealed to **IP67 standards**. This tribology-focused design guarantees low-friction operation and prevents the humidity ingress that plagued their previous units, ensuring reliable actuation every time.
A secure installation is non-negotiable. Beyond the full lug design, every threaded hole undergoes a **Go/No-Go gauge inspection** to guarantee precise thread depth and form for uniform bolt loading. Most importantly, every single valve assembly is subjected to rigorous **hydrostatic testing per API 598 standards**. This includes a shell test at 1.5 times the rated pressure to verify casting integrity and a bi-directional, zero-leakage seat test at 1.1 times the pressure. This is not a batch test; it's a **100% validation** that guarantees each valve is certified leak-proof and structurally sound *before* it enters a critical underground vault.
In us, ThermaGrid found more than a supplier; they found a manufacturing partner that understood that long-term infrastructure requires an uncompromising approach to fundamental engineering. With two decades of proven designs, they could rely on our valves to be the dependable workhorses of their network. Per David Miller: "Their control over the fundamental engineering—from heat treatment to final pressure testing—allows us to focus on our system-level challenges, knowing our foundational components are built to last."
For over 20 years, we have supplied robust fluid control components for the world's most critical infrastructure projects. Every day, we empower engineering leaders like ThermaGrid to build with certainty, allowing them to focus on the complex challenges of powering our future cities. We are proud to provide the field-proven components for a more resilient world.
Our commitment to quality is verified by internationally recognized standards, providing the documentation and peace of mind you need for critical applications.
Ready to configure for your project?
Choose a worm gear for large diameter valves (typically >DN250 / 10"), high-pressure service, or any application requiring precise flow control (throttling). The gear mechanism provides significant mechanical advantage, making it easy to operate valves that would require excessive force with a handle.
The high gear ratio means many turns of the handwheel result in a small, precise movement of the valve disc. This allows operators to finely tune and accurately set a specific flow rate. Furthermore, the self-locking nature of the gear prevents the disc from drifting due to fluid forces, ensuring the set position is maintained.
Self-locking is an inherent feature of the worm gear design where the valve disc cannot be back-driven by the flow. It holds its position firmly without needing an external brake. This is critical for preventing "disc flutter" in high-velocity or vibrating pipelines, enhancing safety, and reducing wear on the valve seat and stem.
Yes, absolutely. Our worm gear operators are designed with a standardized ISO 5211 top flange and drive shaft connection. This universal standard allows for the easy and direct mounting of most electric or pneumatic actuators, simplifying future automation or remote control upgrades.
Our gearboxes are engineered for long life and minimal maintenance. The housing is sealed (IP67 rated) to protect against dust and water ingress, and it comes factory-filled with high-performance grease. We recommend periodic visual inspection and checking the smooth operation of the handwheel during routine plant maintenance cycles.
As a source factory integrating casting, machining, and assembly, JRVAL's product reliability has been verified by the market for over 20 years.
Compare our products against other brands before you commit. We're confident you'll be satisfied after an in-depth investigation.
We provide a comprehensive 2-year warranty covering non-human damage. Spare parts for the valve body, disc, seat, and gear operator are readily available.
Before delivery, we provide complete documentation, including material test reports, heat treatment reports, and mechanical performance tests.
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Address: DaZhan Industrial Park, Xiaozhan Town, Jinnan District, Tianjin, China
Copyright @ 2025. Tianjin Jiangrui Steel Casting Co., Ltd.
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