Self-operated before-valve pressure regulator valve

Self-operated before-valve pressure regulator valve

The Self-operated before-valve pressure regulator valve is an automated system composed of a control valve, actuator, and a spring used for precise pressure setting. It is designed for controlling before-valve pressure in pipelines carrying non-corrosive liquids, gases, and vapors. When the before-valve pressure rises above the designated set point, the control valve is automatically opened to regulate the flow. By utilizing the Self-operated before-valve pressure regulator valve, systems achieve stable pressure management using a cage-guided, balanced trim design that requires no external energy.

Key Features:

• Cage Guided Balanced Trim: Utilizes a balanced trim design to ensure high stability and sensitive pressure regulation.
• Self-Operated Energy Saving: Operates using the energy of the medium itself, eliminating the need for external power sources.
• Maintenance-Free Performance: Features a compact and reliable structure designed for long-term operation without frequent servicing.
• Standard Modular Design: Adopts a modular assembly approach, allowing for various combined control configurations.
• Quick Response: Includes a “quick open” flow characteristic for rapid and efficient pressure adjustment.

Technical Specifications:

• Size: DN15–300 (1/2″–12″)
• Pressure Class: PN1.6, 4.0, 6.4MPa (ANSI 150, 300LB)
• Body Materials: Cast iron (HT200), cast steel (ZG230-450), cast stainless steel (ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti)
• Plug Type: Single-seat (P), double-seat (N), sleeve (M)
• Body Type: Straight-through type
• Pressure Balancing: Stainless steel bellows
• Applicable Temperature Range: -20°C ~ 350°C
• Leakage Class: ASME B16.104 V (soft seal) and ASME B16.104 IV (hard seal)
• Pressure Setting Range: 15 to 2500 Kpa (segmented ranges)
• Set Value Error: ±8% (General) / ±5% (Technical parameter)
• Pipe Connection: Flange type

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