PJZN Pneumatic Double Seat Regulating Valve

I. Features

Our company produces the PJZN type pneumatic diaphragm double seatAdjustable valveUtilizing a dual-guide structure with a multi-spring actuator, the product features compact design, lightweight, sensitive operation, large valve capacity, precise flow characteristics, easy assembly and disassembly. It is widely used in precise control of gases, liquids, steam, and other media, maintaining process parameters such as pressure, flow, temperature, and liquid level at specified values. Suitable for applications with large allowable pressure differences and substantial leakage, yet not clean media. The series includes standard models, bellows-sealed types, and jacket-insulated types, among others. Nominal pressure ratings are PN10, 16, 40, and 64; valve body sizes range from DN20 to 200. Applicable fluid temperatures vary from -200℃ to +560℃, with multiple grades available. Flow characteristics are linear or equal percentage. A wide variety of types and specifications are available for selection, including top-bottom and double-guide double-seat regulating valves. These valves operate with excellent stability, featuring two valve cores and seats, a "four-way" body design that allows easy conversion from top-mounted to bottom-mounted, and from gas-closed to gas-open valves. The body is designed according to fluid dynamics principles with a low-flow resistance cross-sectional channel, offering a high rated flow coefficient and low balancing force, allowing for larger pressure differences. The actuator uses a multi-spring structure, reducing height and weight by 30%, with a wide adjustment range and a natural adjustable ratio of 50%. Bellows-sealed regulating valves provide complete sealing for the moving valve stem, preventing fluid leakage. The regulating valves are equipped with an insulated jacket, suitable for applications where crystallization or solidification occurs after fluid cooling, leading to blockages.
 

II. Overview

1. Valve body, valve cover: HT200

2. Valve Stem and Seat: 1Cr18Ni9Ti, Stellite alloy surfacing

3. Filling Material: Polytetrafluoroethylene, flexible graphite;

4. Corrugated tube: 1Cr18Ni9Ti

5. Filling Sheets: Rubber asbestos board, 10#, 1Cr18Ni9Ti, asbestos wrapped gaskets;

6. Film Cover: A3; 7. Wavy Film Sheet: Nitrile rubber reinforced with polyester fabric.

8. Spring: 60SiMn

9. Valve Rods, Push Rods: 2Cr13, 1Cr18Ni9Ti

10. Liner: 2Cr13

11. Soft Seated Valve Core: Enhanced PTFE

Section 3: Main Technical Parameters

Note: This industrial performance indicator conforms to the GB/T4213-92 standard.

Four: Allowable Pressure Difference

Note: P indicates with valve positioner; for the pressure difference allowed by the shrunken valve body, it is calculated based on the pressure difference allowed by the full capacity valve body of the same diameter.

V. Model Numbering

PJZN—16CK—DN50

P—Pakino Self-Controlling Valve  J—Pneumatic Diaphragm Actuator  Z—Straight Travel

N—Indicates a two-seat regulating valve  16—Indicates pressure grade of 16 kg  C—Indicates carbon steel material

K - Indicates gas opening type                                       DN50 - Indicates nominal valve diameter

Section 6: Order Instructions

1. Product Model and Name; 2. Nominal Pipe Size; 3. Nominal Pressure; 4. Flow Characteristics; 5. Valve Body Material.

6. Rated Flow Coefficient; 7. Medium of Use; 8. Medium Temperature; 9. Pressure Difference Before and After the Valve