Self-sealing gate valve Description

Self-sealing gate valve is a type of gate valve that achieves self-sealing through the pressure of the medium. It is typically manufactured using high-quality materials and advanced processes. Compared to traditional gate valves, it offers higher sealing reliability, lower leakage rates, and a longer service life. The "self-sealing" feature lies in the fact that when the medium pressure acts on the disc, the disc tightly adheres to the seat, achieving a good sealing effect without the need for additional sealing mechanisms. This design simplifies the valve structure, reduces maintenance costs, and enhances reliability. Self-sealing gate valves are widely used in industries such as petroleum, chemical, power, and water treatment for controlling the flow of various media.

‌Characteristics of Self-Sealing Gate Valves‌

‌High Sealing Performance‌
Due to its self-sealing design, the valve maintains excellent sealing performance even under high pressure, effectively preventing medium leakage and ensuring production safety and environmental protection. This is achieved through precision-machined discs and seats, as well as superior sealing material selection-such as corrosion-resistant, wear-resistant alloy steels or specialty materials.

‌Stability and Reliability‌
Imported pressure self-sealing gate valves are typically manufactured using advanced processes and strict quality control systems, ensuring stable and reliable operation. Their simple structure minimizes failure rates, reduces maintenance frequency, and lowers operational costs.

‌Long Service Life‌
High-quality materials and superior craftsmanship extend the valve's lifespan. Corrosion-resistant, wear-resistant valve bodies and discs withstand prolonged medium erosion, prolonging service life.

‌Easy Operation‌
Despite medium pressure involvement in sealing, the valve ensures quick and convenient opening/closing. Manual, electric, or pneumatic actuators are available for flexible drive selection based on application needs.

‌Wide Applicability‌
Suitable for diverse media-including water, steam, oil, natural gas, acids, and alkalis-these valves meet industrial demands across sectors. Proper selection of valve and sealing materials ensures compatibility with specific media.

Self-sealing gate valve Specification

Design Specification

Structure Length: DL/T 531, ASME B16.10, GB/T 12221

Design Standards: API 600, API 6D, ASME B16.34, DL/T 531, JB/T 3595

Connection Standard: DL/T 531, JB/T 3595, ASME B16.25

Pressure Test: API 598, GB/T 13927, GB/T 26480, JB/T 9092, JB/T 3595

Pressure & Temperature Rating: ASME B16.34, JB/T 3595

Performance Parameters

Body Material: Carbon steel, alloy steel

Nominal Diameter: NPS 2″ – NPS 16″ / DN50 – DN400

Pressure Range: CL900 – CL2500 / PN200 – PN420

Operating Temperature: –46°C ~ +600°C

Scope of Application: Suitable for pipelines of water, steam, oil, and superheated steam in power plants, petrochemical, and metallurgical industries with high temperature and high pressure

Applications‌

‌Petrochemical Industry‌

‌Refinery Units:‌ In high-temperature heavy oil pipelines (500°C+), self-sealing gate valves prevent medium leakage, reducing fire hazards.

‌Chemical Production:‌ In pipelines carrying highly corrosive media (e.g., sulfuric acid, chlorine-alkali), hard alloy sealing surfaces resist chemical erosion.

‌Power Industry‌

‌Thermal Power Plants:‌ In main steam pipelines (pressure ≥10 MPa), the self-sealing design accommodates temperature fluctuations and prevents valve bonnet bolt loosening.

‌Nuclear Power Plants:‌ In primary loop coolant systems (radioactive media), metal sealing rings ensure zero leakage, enhancing safety.

‌Metallurgical Industry‌

‌Blast Furnace Gas Pipelines:‌ In high-pressure (0.8–1.2 MPa), dust-laden media, self-sealing gate valves resist wear and are easy to clean, minimizing downtime.