The operation principle of gas heater control valve positioner

1. When the gas heater control valve is initialized, the performance of the entire gas heater control valve has been tested, the parameters are optimized, if you have problems, it will send alarm information. Alarm information: Preventive alarm - control gas heater control valve condition with mild wear, the future will continue to wear, but also to work gas heater control valve; maintenance alarm - badly worn patio heater control valve status, the current can still work, but may occur at any fault ; failure alarm - Remind equipment operators, gas heater control valve failure has occurred. Reaction detection information which appears on the control gas heater control valve assembly; cause failure cause analysis - how to solve the failure.

     2. Before use through smart gas heater control valve positioner can control gas heater control valve original initialization, all gas heater control valves original state after initialization information is stored locator. Such a control Gas Water Heater Valve with intelligent positioners start automatic initialization of work, including determining the mechanical travel range locator best indicator parameters and automatically adjusts its work, the locator information and indicators signal parameters applied mechanically determined based on the current algorithm to control the gas heater control valve opening and closing. Working condition of the Gas valve supplier is normal or not is crucial, locator real time detection and analysis of its uninterrupted, once a fault, it will send an alarm signal detection and analysis of all the results are stored in the memory location, as well as provide diagnostic information to repair malfunctioning equipment and other aspects of the operator or maintenance engineer.

Installation Precautions gas heater control valve

Installation Precautions high pressure Heater Gas Valve
(1) hose in a mobile or stationary, and can not bend over, it can not be bent at the root, at least to start bending at 1.5 times its diameter;
(2) hose moved to the extreme position not pull it too tight, should be more relaxed;
(3) try to avoid the hose twisting deformation;
(4) hose as far as possible away from the heat radiating member, fashion necessary insulation boards;
(5) Avoid hose external damage, such as the use of the same long-term friction surface of the member;
(6) If the hose caused by excessive weight deformation, should support members.
Pre-installed piping
1 Introduction pipeline
(1) two-director and branch Gas Control Valve: From lubrication pump out until all the oil inlet distributor, relatively high under pressure. Usually cold drawn seamless steel gas heater valve, the material is 10 or 15 gauge steel. Severe corrosion of the pipe must not be used;
(2) to the pipeline: from the distributor to all lubrication points out the inlet (bearing hole), under pressure is relatively low. Usually drawn copper, easy to bend when the gas heater control valve. There is also cold drawn seamless steel or stainless steel pipe;
(3) the use of hose fittings encountered active site connections.
Piping layout requirements
(1) gas heater valve to try to avoid the heat radiation and cooling water temperature is too high or too low, such as spraying of the Department, particularly hose fittings;
(2) piping and other equipment should not affect the operation of the host, to be safe, reliable, easy to work, observations, maintenance;
(3) To smooth vertical and horizontal piping, neat appearance. As little as possible, or small-angle bend elbows, using a large arc, thus reducing oil flow resistance;
When the conflict (4) installation occurs, a small tube let bassoon, low-pressure Gas Heater Control Valve so that high-pressure pipe;
(5) the pipeline can not be contacted at the intersecting should spaced;
(6) parallel pipe joints should be staggered installation, to avoid affecting the installation and removal;
(7) In order to facilitate disassembly pipeline cleaning, the union should be properly installed, but to use less, reducing the possibility of leaks.

Gas Heater Valve installation and maintenance of way

The installation and maintenance of way
Prevention of leakage of pipe joints in the gas heater valve, both the metal pipe coupling, or Oven Gas Valve, are prone to leakage problems. For card sets of pipe joints, mostly due to the pipe by a large external force or impact, so that the card sleeve loose or deformed pipe ends and cause leakage, you should check whether the card holder out of round, whether the defect edge, whether the pipe end in good condition and the extent of compression ferrule nut, while also eliminating external piping. For flared Gas Heater Control Valve, mostly due to excessive flaring, substandard quality requirements or repeatedly demolished, resulting in flaring deformation or cracks caused by leaks, then you can be re-flared front end truncated. If the top male and female cones pressure seal, which is mostly due to two cone leak damage, available grinders for grinding cone. In some by "о" or outer-ring seal by the end face of the gas heater valve, the leakage following reasons: "о" ring deformation caused by aging or leakage; "о" ring assembly is not in place, so that the two-plane connection when the pressure is uneven or "о" ring is cut cause leakage; "о" ring uncompacted, insufficient amount of elastic deformation caused by leakage; "о" mouth-ring groove just too deep and cause leaks. In this regard, the need to re-select the same diameter and cross-sectional coarse "о" rings, can also be sealed with a flat opening slot stop cutting or grinding to reduce the groove depth of mouth only, so "о" ring has sufficient amount of elastic Gas Control Valves (compression in general should be between 0.35-0.65mm). For the use of oil and rubber, wool felt, soft steel cardboard combination gasket sealant joints or pipe leaks, no matter what the material is, you should first check the seals without damage, deformation, aging and rough through the large, etc. and then take the appropriate measures.

Card sets of gas heater valve installed

(1) according to the requirements of Chapter 9 of the need for pickling pipes should be pickled;
(2) according to the required length by sawing or patio heater gas valve  machines and other equipment off the tube, and definitely not broken with solvent (such as flame cutting) or cutting wheel; remove the tube ends inside and outside round burrs, metal chips and dirt; removing rust-proof pipe fittings agents and dirt; but also to ensure the pipe roundness;
(3) the nut, ferrule has set into the tube, card sets Gas Control Valve the front edge (diameter end) from the mouth of the tube at least 3mm, then taper pipe into the connector body, until the top;
(4) Slowly tighten the nut, turn the gas safety burner valve until it does not move, then tighten the nut 2 / 3-4 / 3 laps;
(5) Remove the check card sets whether to cut the pipe, the location is correct. Card sets are not allowed to move axially to slightly rotate;
(6) Tighten the nuts again after passing inspection.

Regulating valve technology of routine maintenance

In the soda ash production systems, increasing the degree of automation. The valve as an automatic control system actuators, has an important role in stabilizing the production, optimal control and so on. With a long-cycle, high-load operation, the control valve jam, corrosion, vibration, internal leakage and other problems continue to occur, resulting in shorter Gas Water Heater Valve regulating the life, work reduced reliability, seriously affecting the plant safe and stable operation. Therefore, the need for timely and accurately find and fix faults in the routine maintenance is very important, lists some common symptom and treatment methods. For reference only;

A regulating valve leakage
1, the drain valve stem length discomfort.
The reason valve leakage: gas open valve stem and valve stem is too short too long, stem up (or down) the distance is not enough, resulting in a gap between the plug and seat, not full contact, leading off lax internal leakage.
Solutions: should be shortened (or extended) valve stem to stem the appropriate length, it is no longer endoleaks.
2, packing filler leaked leaked reasons: after (1) Fill the stuffing is loaded into close contact with the stem, but this contact is not very uniform, some parts in contact with loose, tight contact with some parts, and even some parts did not contact on. (2) there is a relative movement between the stem and packing, as the impact of high temperature and pressure and permeability of the medium, resulting in packing leak. (3) the contact pressure is gradually attenuated filler, the filler itself and other reasons, the medium will leak out from the gap.
Solutions: (1) In order to facilitate the filler loading, chamfer at the top of the stuffing, the stuffing is placed at the bottom of the gap erosion resistant metal protective ring of small to prevent the filler is medium erosion. (2) packing box and packing contact surface should be smooth, reduce packing wear. (3) use of flexible graphite as a filler, which has good air tightness, low friction, small deformation, friction does not change after re-tightening and other characteristics.
3, the valve spool core seat deformation leak.
Spool valve leak valve production was mainly due to the process of casting or casting defects can lead to enhanced corrosion and erosion-corrosion medium through the fluid medium will give rise to the valve seat material erosion and impact, resulting in valve, valve seat deformation (or wear) is not complete, there are gaps, leaks.
Solutions: valve, valve seat corrosion-resistant materials. Worn deformation is not serious, can be used fine sandpaper grinding, eliminate traces improve the finish. If severe deformation, only replace the Gas Control Valve, the valve seat.
Second, the positioner fault locator is to use nozzle flapper technical principles, the general failure often occurs following:
1) Parts affected by temperature, vibration, resulting in mediation valve fluctuations.
2) The nozzle is clogged foreign material, the locator does not work.
3) The spring constant change, resulting in mediation valve control nonlinear.
4) electrical connector seal is not good, the rain will be positioned coil shorted or open circuit.
Solutions: The locator fixed firmly; sealed electrical connector; improving the quality of air purification, sewage drainage regularly.
Third, the valve action failure
1, the valve no action.
Cause: Insufficient supply pressure; actuator failure; valve no output signal; a foreign body in the gas safety burner valve; high-temperature parts trim stuck.
Solutions: Check the gas supply, restore pressure; good or bad, and the spring force of the spring to check whether the actuator diaphragm rupture and without damage (pneumatic valves); check signal; disintegration valve, a check for repairs.
2, the valve stroke inadequate Reason: Locator no improper calibration, stroke adjustment; actuator spring rating is too small; a foreign body within the valve.
Solutions: re-adjust the locator; adjust the spring; demolition valve remove the object.
3, the valve causes slow movement: packing too tight or packing deterioration of aging; the stem is not straight, misalignment, causing friction big; small air pressure.
Solutions: Recovery for the wind pressure; replace or repair the valve stem packing and other components.
Regulating valve maintenance and repair is a highly professional, technical extensive work involved. To do this work, not only need a solid theoretical foundation, but also has a wealth of practical experience, to take a scientific approach to improve the level of maintenance, reduce equipment failure rates, ensure plant safety, stability, long, full, excellent running to improve production efficiency and economic benefits.