Pneumatic eccentric rotary valve is composed of pneumatic piston actuator and eccentric rotary valve assembly. FR. Y series of hard and soft seal eccentric rotary valve, is a kind of flexural structure of eccentric rotating valve, it has changed the past the regulator design structure of the traditional concept, can reduce the wear between core city, has small volume, light weight, small flow resistance, large flow capacity, good sealing, its performance can be better than the traditional control valve, and can be widely used in petrochemical, metallurgical, power, light industry, food, paper and other automatic control system, particularly suitable for high viscosity medium occasion.
Main specification
Main technical parameters
A. the valve body
Type: eccentric Angle stroke
Nominal size: 25 ~ 300mm
Nominal pressure: 1.6, 6.4MPa
Connection type: clamping flange standard JB/T79.1 ~ 2-94 FF RF
Materials: WCB, CF8, CF8M
Filling: asbestos - impregnated tetrafluoroethylene, teflon, flexible graphite
Internal assembly
Ball core type: partial sphere (with guide wing)
Spool material: CF8, CF8M nitriding treatment or surface spray welding carbide
The seat material and using temperature: soft seal (R), ptfe, filled ptfe - 20 ~ + 180 ℃
Para polystyrene - 40 ~ + 350 ℃
Hard seal (y) CF8, CF8M or surface spray welding carbide carbide - 40 ~ + 450 ℃
Valve shaft material 2Cr13 17-4ph
Shaft sleeve material casting copper alloy, CF8, CF8M
Executive mechanism
Model no. : 99000 pneumatic piston actuator, GT pneumatic piston actuator (imported or domestic)
DA/SR pneumatic piston actuator (import), AT pneumatic piston actuator (import)
DRD/DRE pneumatic piston actuator (import)
Action: Angle stroke
Structure: double acting - no spring, no original position of actuator, two operating pressures are required when working
Single action - spring, actuator with original position, operating pressure required
Type of actuator and main technical parameters
Executive mechanism model, specification, output torque
Ⅰ. Double-acting pneumatic piston actuator
Ⅱ. Single-acting pneumatic piston actuator
Note: a is K2, a is K3, and b is K4
Main technical performance
Drain leakage quantity: metal seated in accordance with ANSI Ⅳ B16.104-1976, less than 0.01% of rated Cv value
Soft seat in accordance with ANSI Ⅵ B16.104-1976, less than 10-7 of rated Cv value
· speed difference: the positioning device is less than 5% of the full stroke, and the positioning device is less than 2% of the full stroke
Basic error: + / - 5% of total stroke and + / - 2% of total stroke
· adjustable range: 100:1 (full cavity type); 60:1 (60% reduction), 40:1 (40% reduction)
A. Cv value
Fully open valve core Angle: 60 °
Ambient temperature: - 20 ~ + 60 ℃
Valve type: gas-closed or gas-open
Accessories: positioner, air filter pressure reducing valve, handwheel mechanism, limit switch, solenoid valve, valve position transmitter, etc
Curve of current flow: approximate line shape
Adjust actuator configuration to allow pressure differential pressure adjustable P
Ⅰ. Double-acting pneumatic piston actuator (air source pressure 0.5 MPa)
Gas-closed valve, gas-open valve
Note: 1. Equipped with 99000 series pneumatic actuators, the above table is standard configuration
2. When matching other types of actuators, make selection by referring to the output torque and the table above
Ⅱ. Single-acting pneumatic piston actuator (air source pressure 0.5 MPa)
A. Gas-closed valve
B. Air - open valve
Note: 1. Equipped with 99000 series pneumatic actuators, the above table is standard configuration
2. When matching other types of actuators, make selection by referring to the output torque and the table above
3. K3 means the number of springs
External dimensions, weight
Overall dimensions
Note: 1. The size of flange spacing L conforms to the standard pmc23.3a of scientific instrument manufacturers association (SAME)
2. The equipped actuator is 99000 series double-acting pneumatic piston actuator
3. Pn1.6mpa valve
