Specification

TIANYU Pneumatic Parallel Sliding Double Disc Ceramic Gate Valve

I. Product Overview

TIANYU pneumatic parallel sliding double disc ceramic gate valve is a specialized flow control solution engineered for abrasive media handling. Designed with double discs and ceramic sealing surfaces, it integrates pneumatic actuation to deliver reliable shut-off performance in pipelines conveying dry ash, slurry, cement powder, and other wear-prone media. Operating at PN10~PN16 (1.0~1.6MPa) and temperatures up to 200℃, it features a compact structure, flange connections, and compliance with GB/T 12224, ANSI B16.5, and DIN standards. Ideal for power plants, cement factories, mining, and wastewater treatment, it balances wear resistance, fast actuation, and low maintenance—critical for extending service life in harsh industrial environments.

II. Key Attribute Parameters

Category	Details
Size Range	DN50~DN400 (2″~16″), covering small to large-diameter pipelines. Common sizes include DN100 (4″) for ash handling and DN200 (8″) for slurry transfer.
Pressure Rating	PN10 (1.0MPa) and PN16 (1.6MPa), suitable for low to medium-pressure systems like power plant ash discharge lines and cement slurry pipelines.
Temperature Range	≤200℃, adapting to ambient and moderately high-temperature media (e.g., dried ash from boilers).
Material Configuration	– Body & Middle Body: WCB cast carbon steel, offering structural strength and cost-effectiveness for industrial pipelines. – Disc & Seat: Alumina ceramic (Al₂O₃), with hardness ≥HRC85 for exceptional wear resistance against abrasive particles. – Stem: 2Cr13 alloy steel, corrosion-resistant and torque-resistant to prevent bending during actuation. – Packing: Flexible graphite, high-temperature resistant and leak-tight to prevent media seepage. – Pneumatic Actuator: Aluminum alloy cylinder, lightweight and corrosion-resistant for reliable air-driven operation.
Connection Type	Flanged (RF/RTJ), compliant with JB/T 79.1, ANSI B16.5, and DIN 2543 standards. Ensures secure integration with pipelines and easy disassembly for maintenance.
Actuation	Pneumatic (compressed air), with optional manual handwheel for backup. Actuator delivers fast opening/closing (≤10 seconds) for timely process control.
Design Standards	– Design & Manufacture: GB/T 12224 – Flange Dimensions: ANSI B16.5, DIN 2543, JIS B2020 – Testing: GB/T 9092 (hydrostatic and operational tests)

Product Overview

III. Features Description

Double Disc Floating Connection: The two gate discs adopt a floating design, allowing slight axial rotation during opening/closing. This self-aligning feature ensures uniform contact with ceramic seats, distributing friction evenly to avoid linear wear—extending seal life by 300% compared to fixed-disc designs. Under media pressure, the discs press tightly against seats to form a reliable one-way seal, preventing leakage even with abrasive particle buildup.
Ceramic Sealing Surfaces: Discs and seats are lined with high-purity alumina ceramic, sintered at 1600℃ for dense, wear-resistant structures. Ceramic’s hardness (exceeding that of most abrasives) resists scouring from ash, sand, and slurry, maintaining sealing integrity over long service cycles. Unlike metal seals, ceramic avoids particle adhesion, reducing maintenance frequency.
Pneumatic Actuation Efficiency: Compressed air-driven cylinder directly moves the stem to open/close the valve, enabling rapid response—critical for emergency shutdowns in ash handling systems. The actuator’s aluminum body is lightweight, reducing pipeline load, while its compact design fits in space-constrained installations (e.g., boiler rooms).
Structural Compactness: The valve’s integrated design minimizes overall length, simplifying installation in tight pipelines. Flanged connections eliminate the need for complex alignment, and the modular structure allows easy replacement of wear parts (ceramic discs, packing) without disassembling the entire valve.
Safety & Reliability:
- Stem blow-out prevention: A stepped stem design with a packing gland prevents ejection under pressure, enhancing operational safety.
- High-temperature tolerance: Graphite packing maintains sealing at 200℃, avoiding media leakage in hot ash applications.
- Versatile installation: Can be mounted at any angle, adapting to diverse pipeline layouts (horizontal, vertical, or inclined).

Double Disc Gate Valve Application
1. Design and Manufacture: GB/T 12224
2. Face to Face Dimension: Manufacturer’s Standard
3. Flange Dimension: JB/T 79.1, ANSI B16.5 DIN 2543, JIS B2020
4. Inspection and Test: GB/T 9092
5. Material Standard: GB/T 12229 for Carbon Steel, GB/T 12230 for Stainless Steel

Double Disc Gate Valve Installation, Use & Maintenance:

1. Before Installation, it’s necessary to clean the valve and remove possible defects caused in the transportation process.
2.Check carefully whether marks and the nameplate on the valve meet operating requirements.
3. This valve can be insstalled on pipelines at any angle.
4. This valve shall be fully open or fully closed in running and not be used as a throttle valve, or else its sealing surfaces will be washed and get worn faster.
5. For Long term storage, it shall be stored in a dry and ventilated room whth periodic check to avoid rust.
6. Knocking shall be avoided in the transportation process.

Double Disc Gate Valve Structural Features:

1. Use a Cylinder as the actuator to drive the gate directly to move up and down, with fast opening/closing.
2. The double Gate adopt floating connection to produce reliable one-way seal under the medium pressure action. Also the floating connection can drive the gate to rotate up in opening/closing due to misaliginment of axial lines so that the friction grains between the valves’ gate and seat are distributed evenly to produce no linear abrasion, thus improving its service life greatly.
3. Sealing surfaces of the valve’s body and gate are lined with anti-wear ceramics, with excellent resistance to abrasion.
4. Being compact, it’s easy for transportation, installation and maintenance.
Double Disc Gate Valve Working Principle

When the cylinder drives the gate to move downwards through the valve’s stem, sealing surfaces of the valve’s gate and body will be engaged to cut off the channel, namely, closing; the other way around is opening.

IV. Manufacturing Processes

Valve Body Casting & Heat Treatment: WCB carbon steel is cast into 阀体和中间体 via precision molds. Castings undergo annealing at 650℃ to relieve internal stresses, preventing deformation under pressure. Post-casting machining ensures flange faces and internal chambers meet dimensional tolerances (±0.05mm).
Ceramic Component Production:
- Alumina powder (95% purity) is mixed with binders, pressed into disc and seat shapes, and sintered at 1600℃ in airtight furnaces. Sintering eliminates porosity, forming a dense ceramic structure with high hardness.
- Sintered parts are precision-ground to Ra ≤0.8μm, ensuring flat sealing surfaces that mate tightly with minimal leakage.
Stem & Actuator Assembly:
- 2Cr13 stem is CNC-machined with precise threading and surface hardening (HRC45~50) to resist wear during repeated movement.
- Aluminum actuator cylinders are anodized for corrosion resistance, then assembled with pistons, O-rings, and air ports. The actuator is calibrated to ensure linear stem movement and consistent torque output.
Final Assembly & Testing:
- Ceramic discs and seats are press-fitted into the valve body, with alignment checks to ensure floating movement. Graphite packing is layered into the stuffing box to form a leak-tight seal around the stem.
- Testing includes:
  - Hydrostatic shell test: 1.5×PN (e.g., 2.4MPa for PN16) for 30 minutes to verify body integrity.
  - Seat leakage test: 1.1×PN with water, ensuring leakage ≤0.1×DN (mm)/min.
  - Pneumatic operation test: 50+ open/close cycles to confirm smooth actuation and consistent sealing.

Valve Details

V. Product Advantages

Exceptional Wear Resistance: Ceramic seals outperform metal or rubber in abrasive media, extending service life to 5~8 years in ash/slurry systems—reducing replacement frequency and downtime compared to conventional gate valves.
Fast & Reliable Actuation: Pneumatic operation enables quick opening/closing, critical for controlling ash discharge during boiler shutdowns or preventing slurry blockages in mining pipelines.
Low Maintenance Requirements: Floating discs reduce uneven wear, while modular design allows easy replacement of ceramic parts without removing the valve from the pipeline. Graphite packing is re-tightenable, avoiding frequent overhauls.
Cost-Effective Durability: WCB body balances strength and cost, while ceramic components target wear-prone areas—optimizing performance without excessive material expenses. This makes it economical for high-wear applications like cement production.
Wide Media Compatibility: Handles dry ash, wet slurry, cement powder, and granular materials, eliminating the need for multiple valve types in mixed-media facilities (e.g., power plants with ash and wastewater systems).

Application

VI. Product Applications

Power Generation: Controls dry ash discharge from boilers, fly ash conveying lines, and bottom ash slurry systems. Ceramic seals resist erosion from ash particles, ensuring reliable operation in coal-fired power plants.
Cement & Building Materials: Manages cement powder, clinker slurry, and limestone slurry in production lines. Abrasion resistance prevents valve degradation, maintaining consistent flow in mixing and transport processes.
Mining & Mineral Processing: Regulates ore slurry, tailings, and gravel-laden fluids. Pneumatic actuation enables quick response to process changes, while ceramic seals withstand sharp mineral particles.
Wastewater Treatment: Handles sludge, grit, and solid-laden effluents. The valve’s tight sealing prevents leakage of corrosive/abrasive wastewater, protecting pipeline infrastructure.
Chemical & Petrochemical: Controls catalyst slurries and granular additives. Ceramic’s chemical inertness avoids media contamination, making it suitable for catalyst transfer in refineries.

TIANYU pneumatic ceramic gate valve: DN50~DN400, PN10~16, ≤200℃. WCB body, ceramic discs/seats, flange connection. For ash, slurry, powder. Customizable: electric actuator, 99% alumina ceramic for high abrasion, RTJ flanges. Reliable, wear-resistant, ideal for power, mining, cement industries. Ensures long service in harsh media.