Water Hammer Relief, Pilot Operated 2 Port Solenoid Valve VXR21/22/23 Series – Van điện từ khí nén SMC

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Water Hammer Relief, Pilot Operated 2 Port Solenoid Valve VXR21/VXR22/VXR23 Series, For Water/Oil, Normally Closed (N.C.) Specifications – Van điện từ khí nén SMC

Normally closed (N.C.) external appearance

Normally closed (N.C.) display symbol

*When the valve is closed IN and OUT are blocked, but the fluid cannot be blocked when the pressure at port 2 exceeds the pressure at port 1.

Model / Valve Specifications (Normally Open)

*1: This is the grommet value. Add 10 g for conduit types, 30 g for DIN terminals, 60 g for terminals respectively.
*2 See the SMC catalog for details on the maximum and minimum operating pressure differentials and the maximum system pressure.

Solenoid Specifications

• *Value is for when rated voltage is applied and ambient temperature is 20°C ±5°C.
• *It is possible to change the coil from AC to DC during use. However, it is not possible to change from DC to AC.
  (The lack of a shading coil for DC means there may be a humming.)
• *The return voltage is 20% or more of the rated value for an AC power supply and 2% or more of the rated value for a DC power supply.
• *The allowable voltage fluctuation is ±10% of the rated voltage.

Fluid Temperature and Ambient Temperature

*1 50 mm²/s or less.
*2 The D within the parenthesis ( ) is the option symbol.

Structure / Principle Part Materials

Normally closed (N.C.) diagram

Number	Part Name	Material
		Standard	Option
1	Body	CAC408	–
2	Bonnet	CAC408	–
3	O-Ring	NBR	FKM
4	Diaphragm Assembly	SUS, brass, NBR	SUS, brass, FKM
5	Valve Spring	SUS	–
6	Core Assembly	SUS, copper	–
7	Armature Assembly	SUS, NBR	SUS, FKM
8	Return Spring	SUS	–
9	Coil Assembly	Class B molded	Class H molded

Operation

• When the coil (9) is energized, the armature assembly (7) is attracted into the core of the core assembly (6), opening pilot valve (A). When the pilot valve (A) is opened, the pressure in the pressure action chamber (B) falls, opening the main valve (C).
• When the coil (9) is not energized, the pilot valve (A) closes and the pressure in the pressure action chamber (B) increases, closing the main valve (C).

Water Hammer Relief

• A check valve mechanism is provided on the (E) side of the supply orifices (D) and (E). Supply into the pressure action chamber (B) can be controlled in 2 stages by moving the diaphragm assembly (4). After cutting power, orifice (E) will become blocked when the port of main valve (C) reduces in its opening diameter. Having this slower valve closing speed helps alleviate the water hammer effect.