This valve is widely used in petroleum,chemical,pharmaceutical,power and otherindustries,opened and closed inline withnominalpressure islessthan 1.0MPa of oil,steam,watermediumon.
Technical data
产品型号 Product model | Z44T | Z44W | |
公称压力PN(MPa) Nominal pressure | 1.0 | ||
试验压力 Test pressure | 强度(水)(MPa) Strength(water) | 1.5 | |
密封(水)(MPa) Seal(water) | 1.1 | ||
工作温度(℃) Temperature working | ≤200 | ≤100 | |
适用介质 Suitable working | 水、蒸气 Water,steam | 油品Oil | |
Meterial of main parts
零件名称 Part name | 材料Matenal | |
Z44T-10 | Z44W-10 | |
闸板Gate disc | 灰铸铁+黄铜 Cast iron +Brass | 灰铸铁Cast iron |
阀体、阀盖 Body,bonnet | 灰铸铁Cast iron | 灰铸铁Cast iron |
阀杆Stem | 碳钢、黄铜、不锈钢 Carbon steel,brass, stainless steel | 碳钢、黄铜、不锈钢 Carbon steel,brass, stainless steel |
阀杆螺母Stem nut | 黄铜、球墨铸铁 Brass,nodular cast iron | 黄铜、球墨铸铁 Brass,nodular cast iron |
手轮Handwheel | 灰铸铁、球墨铸铁 Cast iron,nodular cast iron | 灰铸铁、球墨铸铁 Cast iron,nodular cast iron |
Main dimensions
DN (mm) |
L |
D |
D1 |
D2 |
b-f |
Z-φd |
H |
D0 |
40 | 165 | 145 | 110 | 85 | 18-3 | 4-φ18 | 240 | 140 |
50 | 178 | 160 | 125 | 100 | 20-3 | 4-φ18 | 260 | 180 |
65 | 190 | 180 | 145 | 120 | 20-3 | 4-φ18 | 300 | 180 |
80 | 203 | 195 | 160 | 135 | 22-3 | 4-φ18 | 345 | 200 |
100 | 229 | 215 | 180 | 155 | 22-3 | 8-φ18 | 395 | 200 |
125 | 254 | 245 | 210 | 185 | 24-3 | 8-φ18 | 478 | 240 |
150 | 280 | 280 | 240 | 210 | 24-3 | 8-φ23 | 558 | 240 |
200 | 330 | 335 | 295 | 265 | 26-3 | 8-φ23 | 720 | 320 |
250 | 380 | 390 | 350 | 320 | 28-3 | 12-φ23 | 845 | 320 |
300 | 420 | 440 | 400 | 368 | 28-4 | 12-φ23 | 990 | 400 |
350 | 450 | 500 | 460 | 428 | 30-4 | 16-φ23 | 1175 | 400 |
400 | 480 | 565 | 515 | 482 | 32-4 | 16-φ25 | 1250 | 500 |
Parallel double disc gate valve: Complete Technical Guide
The Parallel Double Disc Gate Valve is a high-precision industrial valve designed for on/off flow control in medium- and high-pressure pipeline systems. Unlike conventional wedge gate valves, this design uses two parallel discs with a spring or wedge mechanism, ensuring uniform sealing on both sides of the seat. This feature provides excellent tightness, low torque operation, and extended service life.
It is widely used in power plants, water supply networks, oil and gas pipelines, and petrochemical systems, where safety, durability, and minimal leakage are critical.
This guide covers accessory explanations, maintenance frequency, after-sales service, and upgrade options, giving customers a professional reference for installation, operation, and long-term performance optimization.
Every Parallel Double Disc Gate Valve is built with multiple precision-engineered components. Understanding these accessories helps in maintenance, repair, and upgrades.
| Accessory | Description | Function |
|---|---|---|
| Valve Body | Cast steel, ductile iron, or alloy construction | Provides structural strength and withstands pressure |
| Parallel Double Discs | Two flat gate discs | Ensure double-sided sealing for tight shut-off |
| Seat Rings | Hardened metal or resilient material | Provide sealing surfaces against gate discs |
| Spring/Wedge Mechanism | Installed between discs | Maintains uniform pressure against seats |
| Stem | Rising or non-rising type | Transfers motion from actuator/handwheel to discs |
| Bonnet | Bolted or pressure-sealed | Protects stem and internal components |
| Gland Packing | Graphite, PTFE, or composite | Prevents leakage along the stem |
| Handwheel / Actuator | Manual, electric, or pneumatic | Provides valve operation and control |
| Fasteners & Gaskets | Bolts, nuts, sealing rings | Ensure leak-free connections |
Parallel sealing discs minimize wear compared to wedge designs.
Replaceable seat rings allow cost-effective refurbishment.
Automation compatibility supports integration with SCADA and control systems.
Regular maintenance is essential for long service life and reliable performance.
| Component | Inspection Frequency | Maintenance Action |
|---|---|---|
| Valve Body & Bonnet | Every 12 months | Check for corrosion, cracks, or deformation |
| Parallel Discs & Seats | Every 6–12 months | Inspect sealing surfaces for wear; replace if damaged |
| Stem & Packing | Every 6 months | Lubricate stem, adjust or replace packing if leakage occurs |
| Spring/Wedge Mechanism | Annually | Test spring tension or wedge alignment |
| Handwheel / Actuator | Every 6 months | Verify smooth operation; calibrate actuator if required |
| Fasteners & Gaskets | Every 12 months | Tighten bolts, replace gaskets if leakage is detected |
Always depressurize and drain the pipeline before inspection.
Use original spare parts to ensure compatibility and sealing performance.
Lubricate stem threads with high-temperature grease for smooth operation.
In high-pressure systems, conduct hydrostatic testing after maintenance.
A professional after-sales support system ensures customer confidence and uninterrupted operation.
Technical Assistance
Remote or on-site troubleshooting.
Guidance on installation, operation, and upgrades.
Spare Parts Supply
Availability of genuine discs, seats, packing, and actuator components.
Customization for specific industrial needs.
Warranty Coverage
Typical warranty: 12–24 months against manufacturing defects.
Covers valve body, discs, and factory-installed actuators under normal use.
On-Site Services
Valve testing, maintenance, and training for operators.
Assistance in large-scale shutdown or plant turnaround projects.
24/7 Customer Support
Emergency hotline for critical industries.
Fast response for replacement or repair.
Reduced downtime due to quick technical response.
Extended valve life through professional maintenance.
Cost savings by accessing genuine, long-lasting spare parts.
As industrial systems evolve, the Parallel Double Disc Gate Valve can be enhanced with modern upgrades for improved performance and automation.
| Upgrade | Benefit |
|---|---|
| Actuator Retrofit (Electric/Pneumatic/Hydraulic) | Enables remote or automated operation |
| Smart Positioner Integration | Allows precise flow control and system feedback |
| Sealing Surface Upgrade (Hard-Faced Alloys) | Extends service life in abrasive or corrosive media |
| Stem Packing Upgrade (Low-Friction PTFE/Graphite) | Reduces leakage and improves thermal resistance |
| Corrosion-Resistant Coatings | Enhances durability in chemical or marine environments |
| IoT-Enabled Monitoring | Real-time condition tracking and predictive maintenance |
Replace old manual valves with automated actuators to reduce human error.
Apply low-friction coatings on discs and seats to minimize torque and energy use.
Integrate with Building Management Systems (BMS) or SCADA for smarter pipeline management.
The Parallel Double Disc Gate Valve is suitable for industries requiring tight shut-off and long-term reliability.
Power Plants – Steam, condensate, and cooling water systems.
Oil & Gas – Onshore and offshore pipelines.
Petrochemical Industry – Corrosive and high-temperature process lines.
Water Treatment – Distribution and pumping stations.
Industrial Manufacturing – General piping and flow control.
Tight Sealing Performance – Double-disc design ensures uniform contact.
Reduced Seat Wear – Parallel action minimizes friction during operation.
Low Operating Torque – Requires less effort compared to wedge valves.
Long Service Life – High-quality materials resist corrosion and abrasion.
Automation Compatibility – Easily integrates with actuators and control systems.
Easy Maintenance – Replaceable seats and packing for cost-effective servicing.
The Parallel Double Disc Gate Valve is a reliable, durable, and efficient solution for industries that demand tight shut-off, long service life, and easy maintenance. With a robust design, certified quality, structured maintenance schedule, strong after-sales service, and upgrade possibilities, it stands as a dependable choice for power plants, petrochemicals, water treatment, and oil & gas applications.
By adopting regular maintenance, certified spare parts, and smart upgrades, industries can maximize the performance, safety, and energy efficiency of their valve systems.
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