Proportional Valve for Ventilator/Respirator/ICU Instruments Application

• Size: 10.15 * 12.7 * 34.5 mm
• Transport Package: Bulk Package
• Specification: CE, RoHS
• Trademark: Keyto
• Origin: China
• Model NO.: 1451-21-002/5N
• HS Code: 8481804090
• Production Capacity: 200, 000 PCS/Year

Product Description

1 .Production Overview

1.1 Overview of high flow proportional solenoid valve

High flow proportional solenoid valve is Keyto independent research and development of a

large orifice diaphragm solenoid valve, the main function is to control the flow of gas.

Proportional valve control principle: pulse width modulation signal (PWM) control, by changing

drive current of the coil to change the opening degree of the solenoid valve, so that there is a

linear relationship between the current and solenoid valve flow. Proportional valve can take the

way of open loop and closed loop control.

Typical Applications: Ventilators, Oxygenerator/Reservoirs, Anesthesia Delivery & Monitors,

Pressure and Flow Control, Mass flow controller.

 

1.2 Characteristics of high flow proportional solenoid valve
Orifice diameter: 4.5 mm;

Flow rate: 140slpm (pressure 2 Bar, 25ºC, air)

Small dead volume: zero dead volume inside the solenoid valve.

Multiple option for wetted material:

1. Body Material:brass, stainless steel

2. Seal Material:FKM (Special fluoro rubber)

Long lifetime, up to 100 million life cycles at a fixed frequency (not full stroke).
 

1.3 Words Definition

Response Time(T)

Input air/water at 0.25MPa and maximum working pressure drop from inlet port, input

rated control electrical signal to make the tested solenoid valve open and close, then we'll get

the change of outlet pressure which we can measure from pressure sensor. At the same time,

we'll get the lapse of time which starts from power on/off to rise to 90% of max pressure

(normally closed valve) and drop to 10% of max pressure (normally open valve) by quick

response time measure devise. Repeatedly test 3 times and take the average value as the power

on response time and the power off response time.

As engineering experience, it is the design critical value that response time above 50ms.

The aspiration of valve may not stable. Therefore, the response time is not beyond 50ms within

nominal lifetime.

In addition, there is a response time at current method in this industry. The change of

circuit leads to current change, according to the action of solenoid valve. The response time T1,

T2 at current method is normally less than the response time(T) which measured by air flow

method.
 

Seal Capability

Pressure strengthen (outside leakage).

Solenoid valve powers on, the outlet is close, and the inlet water under condition of 5ºC

~40ºC and 1.5 times of nominal pressure. Then ensure all connector won't leak within

1min.

Sealing(inside leakage)

For two normally closed branches, give one port pressures; put the other port into water.

Under the nominal pressure, there is no bubble come out in 1min.

Specification:

Number of ways	2 Way Normally Closed
Function	Pressure compensating valve
Connection	4mm tube
Orifice Size	4.5mm
Fixing	Base mounted (2 X M3 screws, length above 23mm is recommended)
Metal material in contact with media	nickel-plated brass, stainless steel, brass
Non-metal material in contact with media	FKM (optional)
Maximum Flow Rate	140slpm @ p = 2.0 Bar

Withstand pressure	0~7 Bar
Internal leakage	<5sccm @ p = 7.0 Bar
Response Time	<10ms
Cycles per Lifetime	> 100 Million cycles
Temperature range, ambient °C	-10ºC(unfrozen)to 50ºC
Temperature range, media °C	-10ºC(unfrozen)to 50ºC
Rated Voltage	5v;12V;24V (optional)
Power Consumption	2.8 Watts

Electrical connection	Connector connection (optional)
Insulation class, °C	F155

Electrical insulation, volt

500 AC

Photo

1451 Proportional Valve Current vs. Flow Curve (2.0bar)

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