General requirements for installation, application and maintenance of industrial production valves The scope of industrial production valves pressure test and test regulations are introduced in detail

General requirements for installation, application and maintenance of industrial production valves The scope of industrial production valves pressure test and test regulations are introduced in detail

In the installation of flange valves, it is necessary to pay attention to the symmetry and uniform tightening nut. Valve flange and pipe flange must be parallel, void effective, to prevent the valve caused too much stress, for non-metallic materials and low compressive strength of the valve, special attention should be paid to. The threaded connection shall be constructed in accordance with the welding method that conforms to the requirements of the welding process evaluation, so as to prevent the impurities such as soldering jam from entering the pipeline. After electric welding of valves and pipelines, non-destructive testing of welding shall be carried out according to the requirements. Valves with driving mechanism, electrical equipment, gas supply and hydraulic tubing should be connected according to the wiring method or pipeline diagram of the instructions, and the accuracy of wiring should be determined before access.
Upper connection: General requirements for installation, application and maintenance of industrial production valves (I)
4.2.2 Transport
When hoisting the valve, the rope should not be tied to the main shaft or seat, but should be tied to the valve bolt or flange. Spindle or rocker should not be used as handle when transporting.
4.2.3 Connection
4.2.3.1 Select the pipe side connection mode according to the valve connection mode. The pipe flange and screw shall be the same as the valve specification.
4.2.3.2 Pipe connected to valve shall be cleaned to prevent iron pin, fine sand, welding scar and other dirt from destroying valve protrusion.
4.2.3.3 Flange connecting valve installation, should first seal packing (thread and lead oil or PTFE tape) to the pipe thread, to prevent valve running memory accumulation, harm the circulation of material goods.
4.2.3.4 Flange Valve installation, pay attention to symmetry and uniform nut tightening. Valve flange and pipe flange must be parallel, void effective, to prevent the valve caused too much stress, for non-metallic materials and low compressive strength of the valve, special attention should be paid to.
4.2.3.5 The threaded connection shall be constructed in accordance with the welding method conforming to the requirements of the welding process evaluation to prevent impurities such as soldering jam from entering the pipeline. After electric welding of valves and pipelines, non-destructive testing of welding shall be carried out according to the requirements.
4.2.4 Gaskets
Gasket should be selected according to flange type, working pressure level, temperature, material and other conditions.
4.2.5 Connection of driving mechanism
Valves with driving mechanism, electrical equipment, gas supply and hydraulic tubing should be connected according to the wiring method or pipeline diagram of the instructions, and the accuracy of wiring should be determined before access.
4.2.6i is fixed
The foundation as a support valve, the basic assembly should be firm.
4.2.7 Special Requirements
4.2.7.1 Valves with external heat insulation and cold insulation standards shall be constructed with protective layer before entering material.
4.2.7.2 When installing the safety valve, pay attention to the sewage outlet and prevent it from facing the operating personnel.
4.3 Adjustment After Installation
4.3.1 Preparing for Adjustment
Before the system commissioning, the valve should be tested with the pipeline before it can be adjusted. The contact should be checked for leakage. Unique valves shall be specified.
4.3.2 Trial operation of electric valve motor
Control measures in the local control situation, manual valve to the central position, carry out motor trial operation, access the on or off button temporarily stop, check whether the switching direction of the electric valve is consistent with the power switch sign and the valve itself, otherwise need to carry out neutral line fire line inspection or wiring changes.
4.3.3 Setting of travel Switch
4.3.3.1 The general travel switch is set before leaving the factory, and no adjustment is needed.
4.3.3.2 Positioning Settings of the Adjustment switch. Manual valve critical parts, and to rotate 1~2 laps, with the screwdriver and other equipment to adjust the stroke switch critical parts, stroke switch just posture, with a multimeter to detect the stroke switch, export contact data signal should be appropriate.
4.3.3.3 Adjusting the positioning setting is the same as above.
4.3.4 The input of control instructions of electric and electromagnetic induction valves must comply with the regulations of the driving mechanism.
4.3.5 The adverse working pressure of pneumatic and hydraulic valves must comply with the regulations of the driving mechanism.
4.3.6 Valves shall be linked together with system software to check valve action and function.
5 Application
5.1 General Requirements
5.1.1 Valve application shall be carried out in accordance with the operation manual and shall not exceed the application of structural parameters.
5.1.2 Operators must master the basic principles of valve operation through pre-job training. Avoid valve separation, wrong closing, leakage, leakage. Operators should clearly grasp the efficacy of each valve and its position in the process pipeline to avoid misoperation.
5.1.3 Power switch valve is not suitable for throttle valve, the opening and closing parts should not be in the center position for a long time. Such as stop valve, stop valve, gate valve, plug valve and other disconnect valves.
5.2 Manual valve operation
5.2.1 When the valve power switch is operated, it is necessary to pay attention to the direction of the valve switch. Generally, the main shaft or rocker valve is opened counterclockwise and the valve is closed clockwise.
5.2.2 Manual operation of the valve, the force should be symmetrical, encounter stuck, need to check the reason in time. Generally can not rely on financial leverage or wrench operation, avoid excessive force, damage to the surface and other parts.
5.2.3 When the valve of vapor and vapor-liquid two-phase material is opened, it shall be opened slowly to remove condensate in the pipeline and avoid water crash.
5.2.4 For cut-off valves, cut-off valves and valves with large diameter intake valves, when opening, the intake valve should be opened first, and then the valve should be opened slowly. When closing the valve, the intake valve should be closed first, and then the main valve should be closed slowly.
5.3 Fully automatic valve operation
5.3.1 Steam trap, first use the pipeline bypass valve to clear condensate, if there is steam turn off the bypass.
5.3.2 Valves shall be checked frequently.
5.3.3 Adjust the valve according to the requirements of the working condition, choose the appropriate adjustment characteristic parameters.
5.4 Other door Embellishment operations
5.4.1 For valves that rely on electric, electromagnetic induction, pneumatic and hydraulic valves and other devices to open and close, complete remote operation by instrument panel, electric switch, etc. The operator must deeply analyze the relevant structural characteristics and principles of the valve, understand the operation technical specifications, and be able to carry out emergency solutions in case of accidents.
5.4.2 Electric valve It is necessary to pay attention to the matching of style and motor in valve operation, which should not exceed the applicable range.
5.4.3 When the valve is working, it is generally not allowed to relieve pressure and disassemble or fill filling materials.
5.4.4 Continuous high and low temperature medium valve operation, operation personnel especially in the need to pay attention to safety protection and safety.
6 Maintenance
6.1 The valve shall be stored in the dry ventilation room, and both sides of the channel shall be blocked.
6.2 Valves in long-term storage shall be maintained regularly, waste shall be eliminated, and rust prevention agent shall be applied on the production and processing surface.
6.3 Do not operate the valve for a long time. If it is very possible, the position should be carried out regularly to ensure the integrity of its function.
6.4 Periodically maintain the following:
6.4.1 Screw wear degree of valve seat and stem nut, and timely carry out wetting.
6.4.2 Check whether the junction of the valve is loose and fix it in time.
6.4.3 Is the filling material outdated and invalid? If it is damaged, it should be replaced regularly. The valve packing box is not suitable for pressing tight, and it is best that the sleeve joint does not leak and the seat can rotate sensitively.
6.4.4 Check the wear or change of the positioning position of the power switch and the wear degree of its protruded surface. And timely correct the positioning replacement seal ring.
6.5 Grease the valve
6.5.1 Appropriate amount of highly recommended lubrication grease shall be injected into the seat or sealable seat in a timely manner in accordance with the instructions for use.
6.5.2 In order to ensure the actual effect of valve grease, it is sometimes necessary to open and close the valve, carry out safety inspection on the actual effect of lubricating oil, and make sure that the surface surface of valve opening and closing parts is smooth.
6.5.3 Pay attention to the valve switch position during grease injection. If necessary, sewage treatment and pressure relief should be carried out first.
6.5.4 After fat injection, be sure to seal the fat injection port. Prevent the residue from entering or lipid injection outlet lipid air oxidation, seal to wipe antirust grease, prevent rust.
6.6 When the temperature is below 0℃, it is necessary to pay attention to cold prevention for valves that are not in use, and immediately open the bottom wire plug of the valve to discharge the condensed water inside. For valves that can not be discharged and interrupt the relevant work, insulation measures should be taken.
6.7 During valve maintenance, attention should be paid to the daily maintenance of actuators and transmission devices. Cleaning shall be carried out according to the instructions of actuators. In particular, water seepage of the actuator should be avoided to prevent corrosion of the mechanical parts of the internal structure or cold cleaning in winter.
6.8 When the valve leaks, it is necessary to determine the leaking position and reason in time and to solve the relative problem. In general, there are two kinds of leakage and leakage. The exposure is divided into filling material leakage and single flow valve, oil circuit plate leakage or lining raw material leakage according to its external structure.
6.9 Valves with special requirements shall be maintained according to their application maintenance instructions.
(1) [Basic knowledge of Valve Fittings Manufacturing network in Our country] This standard describes the pressure test terms, relevant situations, regulations, testing methods and process and provisions of experimental results for industrial metal materials valves. A hot pressure test for the entire valve housing, which is connected to the oil plate and the valve cover. The purpose is to test the bearing capacity, compressive capacity and density of the valve housing and all housing including the fixed and stationary contact. test fluid temperature The temperature of a pressurized substance or gas used to test valve pressure.
Industrial valve pressure test
category
This standard for industrial metal valves pressure test terminology, pressure test related information, pressure test regulations, test methods and procedures and test results.
This specification applies to industrial metal valves. This specification shall be used in conjunction with the product implementation standard of valves.
This specification can also be widely used for other types of valves after approval by both parties.