High-Pressure Single-Seat Control Valve

Summary:A valve designed for high-temperature and high-pressure special operating conditions, primarily used in thermal power generation and high-temperature steam boiler applications.

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Product Details

Overview

The valve features a simple structure and a straight-through, arc-shaped flow path, ensuring excellent flow capacity. It consists of components such as the valve body, valve seat, valve core, stem, packing gland, and bonnet. The flow path is designed in an S-shaped streamline, offering minimal pressure drop loss, high flow rate, and a wide adjustable range.
The valve core is equipped with a dedicated guide sleeve, offering a large guiding area and excellent vibration resistance for smooth operation. The valve seat and valve core are precisely aligned, ensuring high adjustment accuracy. Depending on the specific application requirements, it can be fitted with either a pneumatic or electric actuator, boasting features such as a compact design, small footprint, lightweight construction, strong output force, and highly responsive performance.
Due to the valve's design, which features only one valve core and valve seat, the valve core experiences a significant unbalanced force during fluid flow. Therefore, this series of valves is primarily suited for applications where minimal leakage is permitted and where the pressure difference before and after the valve is relatively low. They can be widely used to control fluids under a variety of different pressure and temperature conditions.

Structural Form

Flow Characteristics

Major Components and Supporting Materials

Valve	Components	Structural Type	Material Kit	Note
	Valve body	Straight-through single-seat spherical body	Carbon steel, stainless steel, alloy steel	Casting, forging, welding
	Valve core	Plunger Parabola	Stainless steel, special alloy steel	Special requirement: Surfacing welding or spray coating treatment
	Valve seat	O-type external thread	Stainless steel, special alloy steel	Special requirement: Surfacing welding or spray coating treatment
	Valve cover	Room-temperature, elongation-type heat-dissipating metal bellows type	Carbon steel, stainless steel	The length of expansion varies depending on temperature levels.
	Filler	V-shaped, O-shaped	PTFE, Flexible Graphite
	Sealing gasket	Serrated	Stainless steel, special alloy steel
	Guidance Ring	Split-type, integrated type	Carbon steel, stainless steel, alloy steel	Split-type bushing
Executive Agency	Pneumatic diaphragm multi-spring type, cylinder		Spring range (kPa): 20–100, 40–200, 80–240, 120–240
	Pneumatic diaphragm multi-spring type, cylinder		Input signal (kPa): 150–400; Positioner: 4–20 mA DC, 1–5 V
	Entirely electronic models 3610L, 3810L, and the PS series		Input signal 4–20 mA.DC, wiring 2-1/2 NPT

Features

A valve designed for high-temperature and high-pressure special operating conditions, primarily used in thermal power generation and high-temperature steam boiler applications.

Main Technical Parameters

Nominal diameter: DN20–DN100 mm

Nominal pressure: PN10–42 MPa, ANSI 900–2500

Flow characteristics: Linear, equal-percentage; Flow coefficient Cv: 0.25–175; Leakage class: Class IV

Adjustable ratio R: 30:1

Connection types: Flanged, welded. Operating temperature: -46°C to +560°C

Keywords: High-Pressure Single-Seat Control Valve

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