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• Time of issue:2019-11-26
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(Summary description)Check before adjusting valve installation
1.1 Before the installation of the regulating valve, check whether the product certificate of the regulating valve, the installation instruction manual are complete.
1.2 The appearance of the control valve should be checked before installation and should meet the following requirements:
a) The outer surface must be free from defects such as cracks, trachoma, mechanical damage, rust, and dirt;
b) The nameplate must not fall off, and the technical parameters on the nameplate are consistent with the system design requirements;
c) Both ends of the regulating valve should be protected by protective covers;
d) There should be no defects such as stagnant water, rust, dirt and damage in the valve body;
e) There should be no paint on the thread of the thread connection, the thread is intact, there should be no radial grooves on the sealing surface of the flange that affect the sealing performance, the groove at the welding end is intact, and there should be no mechanical damage that affects the welding;
f) The inner surface of the valve body of the rubber lining, the ceramic lining of the lining and the plastic lining should be smooth and smooth, and the lining layer and the substrate should be firmly bonded without defects such as cracks and blisters.
1.3 Control valve opening and closing inspection and water pressure test Control valve (except safety valve) should be flexible to open and close, and the position indicator should be accurate. Prior to installation, the control valve should be manually turned on and off three times to check for jamming.
Regulating valves (except safety valves) have been shipped for more than one year, and pressure testing is recommended under conditions. Petrochemical and related industry regulating valve tests are conducted in accordance with the provisions of JB / T9092. General industrial regulating valve tests are subject to GB / T13927. Required.
2.1 General requirements for regulating valve installation
2.1.1 Read the installation and operation manual carefully before installing the regulating valve.
2.1.2 Regulating valve with flow direction shall be installed according to the flow direction of the regulating valve.
2.1.3 Under normal circumstances, do not install the handwheel of the control valve downward to avoid valve stem corrosion.
2.1.4 The installation position of the regulating valve should be convenient for operation and maintenance.
2.2 When lifting the control valve, the lifting rope should not be tied to the hand wheel or the valve stem, and it should be tied to the lifting ear or flange of the control valve. When carrying, the handwheel or handle should not be used as a handle.

Connection of control valve
2.3.1 According to the connection type of the control valve, select the connection type on the pipeline side. The pipeline flange and thread should be the same as the standard of the control valve.
2.3.2 The pipeline connected to the regulating valve should be cleaned to avoid iron chips, sand, welding slag and other debris from damaging the sealing surface of the regulating valve.
2.3.3 When installing the threaded control valve, the sealing packing (leaf hemp plus lead oil or Teflon raw material tape) should be wrapped on the external thread to prevent the valve from accumulating and affecting the medium flow.
2.3.4 When installing the flange regulating valve, pay attention to tighten the bolts symmetrically and evenly. The flange of the control valve must be parallel to the flange of the pipeline, and the clearance is reasonable to avoid excessive stress on the control valve. In particular, pay attention to the control valve with brittle materials and low strength.
2.3.5 The welding connection shall be constructed in accordance with the welding process qualified by the welding process to prevent debris such as welding slag from entering the pipeline. After the control valve and the pipeline are welded, the non-destructive inspection of the weld seam shall be performed as required.
2.4 Gasket Gasket should be reasonably selected according to the requirements of flange type, pressure level, temperature, medium, etc.
2.5 Driving device The regulating valve of the driving device is connected to the electrical, pneumatic and hydraulic pipelines according to the wiring diagram or piping diagram of the instruction manual. Before connecting, confirm the correctness of the wiring.
2.6 The regulating valve with fixed foot support shall be installed firmly.
2.7 Special requirements
2.7.1 Regulating valves with external insulation and cooling requirements shall complete the construction of the protective layer before entering the medium.
2.7.2 Safety valve installation should pay attention to the location of the discharge port to avoid facing the operator.
Adjustment valve after installation
3.1 Preparation before commissioning Before commissioning the system, the hydraulic valve should be tested with the regulating valve togeth