Vertical Plug-Type Quick-Open Blind Plate

Use discontinuous threads for the connection. When opening or closing the blind flange, simply interlock the discontinuous threads alternately, then rotate it slightly—this completes the process of opening or closing the flange.

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Snap-Latch Quick-Open Blind Plate

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　　Performance and Features

　　This blind flange is a domestically developed, independently branded product with proprietary intellectual property rights. Compared to other blind flanges, its key features include: a simple design with virtually zero failure rate; convenient operation and high reliability for safe use. However, due to its structural design, this blind flange is suitable only for small-diameter applications where the design diameter does not exceed 500 mm.

　　How it works

　　As shown in the lower-right diagram, this method uses an interrupted thread for connection. To open or close the blind flange, simply interlock the interrupted threads alternately and then rotate it by a specific angle—this completes the process of opening or closing the flange.

　　Equipped with a safety interlock device

　　Similarly, this product is also equipped with a safety interlock device to prevent accidental operation and ensure safety.

　　Its function is as follows: Before closing the blind plate, this device must be properly installed—otherwise, the equipment cannot be pressurized. And before opening the blind plate, this device must first be deactivated to safely release any residual pressure inside the equipment; otherwise, the blind plate will remain locked and unable to open.

　　Main uses

　　Quick-opening pressure vessel

　　Crude oil filter

　　Natural Gas Filtration Separator

　　Pipeline Pig Receiving and Launching Device (commonly known as: Pig Launcher/Receiver)

　　Scope of Application

　　Design diameters (mm): 150, 200, 250, 300, 350, 400, 450, 500

　　Design Pressure (MPa): 1.6, 2.5, 4.0, 5.0, 6.3, 8.0, 10

　　Design code: CKMB350/4.0-L CKMB – Product code, 350 – Design diameter, 4.0 – Design pressure, L – Vertical, KZ – Horizontal

　　Note: 1. The design diameter refers to the inner or outer diameter of the equipment connected to the quick-opening blind plate.

　　2. The diameter and design pressure can be customized according to requirements.

　　Ordering Instructions

　　When placing an order, customers must provide the following information:

　　Provide the equipment inner diameter, wall thickness, and weld preparation type for devices connected to the quick-opening blind flange, or directly specify the blind flange's design inner diameter.

　　Provide the design pressure or operating pressure, design temperature or operating temperature, working medium, and its corrosion characteristics.

　　Provide the material for blind flange designs (forgings) or the material of equipment welded to the blind flanges;

　　Vertical or horizontal— for horizontal models, specify whether they open left or right.

　　If it’s a sulfur-resistant material, are HIC and SSC test reports required, among other documents?

Application Cases