Specification

DN1200 PN10 Top Mounted Flange Manual Stainless Steel Trunnion Mounted Ball Valves

I. Product Overview

TIANYU’s DN1200 PN10 Top Mounted Flange Manual Stainless Steel Trunnion Mounted Ball Valve is a heavy-duty industrial valve engineered for large-scale fluid control systems. Designed to handle high-volume flow in medium-pressure environments, it combines the stability of a trunnion-mounted ball structure, the convenience of a top-mounted design, and the corrosion resistance of stainless steel. Ideal for scenarios where reliable sealing, easy maintenance, and manual operation are prioritized, this valve delivers consistent performance across diverse industrial pipelines.

II. Important Attribute and Specification Parameters

A. Structural Type

The valve features a trunnion-mounted ball design, where the ball is supported by upper and lower trunnions (fixed shafts) to prevent displacement under flow pressure—critical for large-diameter valves like DN1200. Its top-mounted structure positions the operating mechanism and maintenance access points on the valve top, simplifying internal component inspection and repair. As a full-bore ball valve, its flow path matches the pipeline diameter, minimizing pressure loss and ensuring unobstructed fluid transfer.

B. Size and Pressure Rating

With a nominal diameter (DN) of 1200, it is tailored for large-scale pipelines, capable of handling high-volume flow rates—essential for applications like municipal water transmission or industrial wastewater systems. The pressure rating of PN10 (equivalent to Class150) enables stable operation under a maximum working pressure of 10 bar, suitable for medium-pressure scenarios such as irrigation networks, cooling water circuits, and low-pressure chemical transfer lines. It accommodates media temperatures from -20°C to 200°C, adapting to both ambient and moderately high-temperature fluids.

C. Material Composition

Valve Body and Ball: Constructed from stainless steel (304 as standard, 316 as an option). 304 stainless steel offers excellent corrosion resistance against water, air, and mild chemicals, while 316 enhances resistance to chlorides and marine environments—ideal for coastal or wastewater applications.
Seat and Trunnions: Seats use a combination of metal (alloy steel) and PTFE for balanced sealing: metal ensures durability under high flow, while PTFE provides tightness. Trunnions are made from forged stainless steel, offering high strength to support the large-diameter ball.
Stem and Packing: The stem is 316 stainless steel, resistant to corrosion and bending under torque. Packing uses flexible graphite or PTFE to prevent stem leakage, with low-friction properties to ensure smooth manual operation.

D. Connection and Operation

Flange end connections conform to international standards (EN 1092-1, ANSI B16.5), featuring drilled flanges for direct bolting to pipeline flanges—simplifying installation without specialized tools. Operation is manual, utilizing a gearbox-driven handwheel: the gearbox reduces the torque required to rotate the large ball, making manual operation feasible even for DN1200 valves. The handwheel includes position indicators (open/closed) for clear operational feedback, with optional locking devices to prevent unauthorized adjustment.

Product Overview

III. Features Description

A. Trunnion-Mounted Stability

For large-diameter valves like DN1200, the trunnion design is critical: it distributes the ball’s weight and flow pressure across the trunnions, preventing sagging or misalignment that could cause leakage. Unlike floating ball valves (which rely on media pressure for sealing), trunnion-mounted balls maintain consistent contact with seats regardless of flow direction—ensuring reliable sealing even in bidirectional flow systems, such as water distribution networks.

B. Top-Mounted Maintenance Access

The top-mounted structure allows technicians to access internal components (ball, seats, trunnions) by removing the top cover, eliminating the need to disconnect the valve from the pipeline. This is particularly valuable for DN1200 valves, which are heavy and costly to remove. Routine tasks like seat replacement, packing adjustment, or trunnion lubrication can be completed onsite, reducing downtime in critical systems like municipal water supply.

C. Manual Operation with Gear Assistance

The gearbox-equipped handwheel reduces the torque needed to operate the large ball, making manual control feasible for operators. The gear ratio (typically 30:1) allows smooth rotation even when the valve is under pressure, with a quarter-turn (90°) movement to switch between fully open and closed positions—saving time during operation. The handwheel’s ergonomic design includes a non-slip grip, enhancing safety during use.

D. Full-Bore Flow and Sealing Performance

The full-bore design ensures the valve’s internal diameter matches the pipeline, minimizing flow resistance and energy loss—vital for large-volume systems where pump efficiency is critical. The metal-PTFE composite seat combines the best of both materials: metal resists wear from particulate media (like wastewater solids), while PTFE conforms to surface irregularities for tight sealing, achieving leakage rates below API Class VI standards.

IV. Manufacturing Process

A. Material Inspection and Preparation

Stainless steel raw materials undergo rigorous testing: 304/316 plates are checked for chemical composition via spectrometry to verify chromium (18-20%) and nickel (8-12%) content, ensuring corrosion resistance. Forged trunnions and stems undergo ultrasonic testing to detect internal defects, while PTFE seat materials are inspected for purity to avoid sealing failures.

B. Precision Machining

CNC machining centers shape the valve body and flanges to strict tolerances (±0.5mm for DN1200), ensuring flange alignment with pipelines. The ball is precision ground to a surface roughness of Ra 1.6μm, with trunnion shafts machined to concentricity within 0.05mm to prevent wobble. Seat recesses are milled to match the ball’s curvature, ensuring uniform contact. The gearbox is assembled with hardened gears to handle high torque, with lubrication channels for smooth operation.

C. Assembly and Testing

Assembly occurs in a controlled environment to prevent contamination. Trunnions are fitted with bearings (bronze or PTFE) to reduce friction, and seats are installed with precise preload to balance sealing and torque. Post-assembly, each valve undergoes:

Shell pressure testing (1.5× PN10) to check body integrity;
Seat leakage testing (1.1× PN10) using water or air, with leakage rates limited to <0.1 l/h for DN1200;
Operation testing to ensure the handwheel rotates smoothly through 90° without jamming.
Final inspection includes gearbox torque verification and flange flatness checks.

Valve Details

V. Product Advantages

A. Large-Diameter Flow Efficiency

The DN1200 size and full-bore design handle high-volume flow with minimal pressure loss, making it ideal for large-scale systems like municipal water transmission or industrial cooling loops—reducing energy costs associated with pump operation.

B. Low Maintenance Requirements

Top-mounted access eliminates the need for pipeline disconnection during repairs, cutting maintenance time by 70% compared to side-entry valves. The trunnion design and durable materials (stainless steel, alloy seats) extend service life to 15+ years under normal use, lowering long-term costs.

C. Reliable Sealing in Diverse Media

The metal-PTFE seat seals effectively with clean fluids (water, air) and media containing small particulates (wastewater, slurry), avoiding the clogging issues common in smaller valves. This versatility reduces the need for specialized valves in mixed-media systems.

D. Cost-Effective Manual Operation

The gear-assisted handwheel eliminates the need for expensive actuators, making it a budget-friendly choice for applications where automation is unnecessary (e.g., remote irrigation networks). Its simple design reduces failure risks compared to complex electric/pneumatic systems.

Application

VI. Product Applications

A. Municipal Water and Wastewater

Used in water transmission mains, reservoir outlet lines, and wastewater treatment plants. The large diameter handles high-volume flow, while stainless steel resists corrosion from chlorinated water and sewage. Easy maintenance minimizes disruptions to public water supply.

B. Industrial Cooling Systems

Applied in power plants, steel mills, and chemical facilities to control cooling water flow. The full-bore design ensures efficient heat transfer, while the trunnion structure withstands the cyclic pressure of cooling loops.

C. Irrigation and Agriculture

Suitable for large-scale irrigation networks, where manual operation (via gearbox) allows farmers to adjust water flow to fields. The PN10 rating handles irrigation pump pressures, and corrosion resistance ensures longevity in outdoor, wet environments.

D. Low-Pressure Chemical Transfer

Used in industries handling non-aggressive chemicals (e.g., fertilizers, detergents) in large-diameter pipelines. 316 stainless steel options resist corrosion from mild acids, while the manual operation provides precise control over transfer rates.

DN1200 PN10 Top Mounted Flange Manual Stainless Steel Trunnion Mounted Ball Valves

Specification

DN1200 PN10 Top Mounted Flange Manual Stainless Steel Trunnion Mounted Ball Valves

I. Product Overview

II. Important Attribute and Specification Parameters

A. Structural Type

B. Size and Pressure Rating

C. Material Composition

D. Connection and Operation

Product Overview

III. Features Description

A. Trunnion-Mounted Stability

B. Top-Mounted Maintenance Access

C. Manual Operation with Gear Assistance

D. Full-Bore Flow and Sealing Performance

IV. Manufacturing Process

A. Material Inspection and Preparation

B. Precision Machining

C. Assembly and Testing

Valve Details

V. Product Advantages

A. Large-Diameter Flow Efficiency

B. Low Maintenance Requirements

C. Reliable Sealing in Diverse Media

D. Cost-Effective Manual Operation

Application

VI. Product Applications

A. Municipal Water and Wastewater

B. Industrial Cooling Systems

C. Irrigation and Agriculture

D. Low-Pressure Chemical Transfer

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