Van Giảm Áp – PRESSURE REDUCING

Với áp lực đầu vào cao hơn mong muốn, khách hàng có thể dụng giải pháp van giảm áp để điều chỉnh áp lực đầu ra hợp lý hơn. Việt An Enviro là nhà nhập khẩu trực tiếp van giảm áp nước bằng cơ chế thông minh tự động điều chỉnh áp suất thủy lực của hãng van Singer Valve – Canada.

1. Pressure Reducing Control with Integral Backup 106 / 206-PR-SM

106-206-PR-SM

KEY FEATURES

+ Ideal for applications where failure is not an option

+ Includes a back-up system to protect against diaphragm or pilot failure

+ Reduces unnecessary maintenance

+ Provides downstream surge protection

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The 106-PR-SM and 206-PR-SM series control valves are engineered to be used anywhere pressure reducing valve failure is unacceptable. These valves have a second and independent operating system superimposed upon the standard primary system. With the assurance of a back-up system, maintenance schedules may be extended as pressures will continue to be controlled even in the event of failure with the primary system.

Under normal pressure reducing conditions, the primary pilot senses the downstream pressure through a connection at the valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm in the lower operating chamber. The downstream pressure is maintained virtually steady at the pilot set-point that is adjustable.

Should the primary pilot system and / or main valve fail to control the downstream pressure, the independent back-up pilot system will begin to operate. It controls the pressure above the diaphragm in the second operating chamber. The back-up pilot is set slightly higher than the primary pilot. The forces now operating in the top chamber assume control of the inner valve assembly and maintain pressure reducing control. During back-up operation only, there is a small (1 USGPM / 0.063 L/s) continuous discharge that should be taken to drain.

The secondary pilot continually senses the downstream pressure. Should there be a rapid rise in downstream pressure for any reason, the secondary pilot will respond quickly, and will pressurize the top chamber. This will compliment the primary pressure reducing controls and provide faster response.

2. Pressure Flow Control (Modulation) Valve 106 / 206-PFC

106-206-PFC

 

KEY FEATURES

+ Reduces downstream pressure when demand is low to reduce leakage and pipe breaks.

+ Compensates for pressure loss in the pipe to keep a fairly constant pressure at a distant point. This reduces the pressure during low flow in most of the system.

+ Simple to set-up and adjust.

+ Maximum pressure increase can be limited by simple adjustment.

+ Pressure increase is adjustable

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The 106-PFC / 206 PFC Pressure Modulation Valve is a pressure reducing valve with a special (Patented) pilot that increases downstream pressure as flow increases.

The PFC valve alters and controls pressure with flow to create virtually constant pressure at the critical pressure point in a system. It will also automatically adjust for distribution friction losses. The PFC valve will deliver consistent performance as it has no electrical components and is not affected should the valve chamber be flooded. The valve may be used wherever a standard PRV is installed.

 

3. Pressure Reducing Valve106 / 206-PR

http-singervalve.comfrproducts106-206

 

KEY FEATURES

+ Reduces downstream pressure when demand is low to reduce leakage and pipe breaks.

+ Compensates for pressure loss in the pipe to keep a fairly constant pressure at a distant point. This reduces the pressure during low flow in most of the system.

+ Simple to set-up and adjust.

+ Maximum pressure increase can be limited by simple adjustment.

+ Pressure increase is adjustable.

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The 106-PR and 206-PR series pressure reducing valves are based on the 106-PG or 206-PG main valves.The pilot valves sense the downstream pressure through a connection at the valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm. The downstream pressure is maintained virtually steady at the pilot set-point.In typical pressure reducing applications, the reduced port model 206-PR is often the best selection.

 

4. Pressure Reducing Valve with Low Flow By-Pass 106 / 206-PR-48

PR-48

 

KEY FEATURES

+ Maintains stable flow right down to zero

+ Precise and reliable pressure setting

+ By-pass piped in parallel to reduce space requirements

 

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The 106-PR-48 and 206-PR-48 series pressure reducing valves with low flow by-pass are based on the 106-PG or 206-PG main valve. In addition, a direct acting pressure reducing valve is piped in parallel, using the main valve back port connections.The pilot valve senses the downstream pressure through a connection at the main valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the main valve position by modulating the pressure above the diaphragm. The downstream pressure is maintained relatively steady at the pilot set-point.The by-pass valve is set 5 psi / 0.35 bar higher than the main valve. Under low flow conditions, the main PR valve closes and the by-pass stays open, controlling the pressure at very low flows without seat chatter.

In typical pressure reducing applications, the reduced port Model 206-PR-48 is often the best selection.

 

5. Pressure Reducing and Check Valve 106 / 206-PR-C

PR-C

 

KEY FEATURES

+ Excellent low flow stability

+ Drip-tight closing on return flow

+ Easily and precisely set downstream pressure

TYPICAL APPLICATION

 

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The 106-PR-C and 206-PR-C pressure reducing and check valves are based on the 106-PG or 206-PG main control valve.

The pilot valve senses the downstream pressure through a connection at the valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm. The downstream pressure is maintained relatively steady at the pilot set-point.

The pilot check valves direct downstream pressure above the diaphragm to close the valve when the system pressures reverse (when the downstream pressure is higher than the upstream).

In typical pressure reducing applications, the reduced port model 206-PR-C is often the best selection.

 

6. Pressure Reducing and Pressure Sustaining Valve 106 / 206-PR-R

PR-R

KEY FEATURES

• Excellent low flow stability

• Ensures minimum upstream pressure

• Easily and precisely set downstream pressure

TYPICAL APPLICATION

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The 106-PR-R and 206-PR-R pressure reducing and pressure sustaining valves are based on the 106-PG or 206-PG main valve with the addition of the sustaining pilot 81-RP and pressure reducing pilot PR-160.

Provided the upstream pressure setting is satisfied, the 81-RP pilot is kept open, permitting the valve to be controlled by the 160 pilot. The 160 pilot senses downstream pressure and under flowing conditions, it reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm.

Should high demand cause the inlet pressure to fall to the 81-RP pilot setting, the upstream pressure has priority and the valve will modulate to prevent the upstream pressures from dropping below the set-point.

When the valve is modulating to sustain upstream pressure above the minimum 81-RP pilot set-point, the downstream 160 pilot may try to open the valve to maintain its set-point, but upstream has priority and downstream pressures will fall below expectations.

In typical applications, the reduced port model 206-PR-R is often the best selection.

7. Pressure Reducing Valve with Downstream Surge Protection 106 / 206-PR-S

PR-S

 

KEY FEATURES

• Excellent low flow stability

• Automatically reduces downstream surges during sudden demand reductions

• Easily and precisely set downstream pressure

TYPICAL APPLICATION

 

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The 106-PR-S and 206-PR-S pressure reducing valves with downstream surge control are based on the 106-PG or 206-PG main valve.

Pressure reducing pilot valve senses the downstream pressure through a connection at the valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm. The downstream pressure is maintained relatively steady at the pilot set-point.

The surge pilot senses the downstream pressure. If the pressure rises above the pressure reducing pilot setting and reaches the surge pilot setting, the surge pilot opens in order to close the main valve rapidly.

8. Pressure Reducing Valve with Solenoid Shut Off 106 / 206-PR-SC

KEY FEATURES

• Excellent low flow stability

• Fast-acting solenoid override

• Operates as normally open or closed

• Easily and precisely set downstream pressure

 

PR-SC

TYPICAL APPLICATION

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The 106-PR-SC and 206-PR-SC pressure reducing valves with solenoid shut-off are based on the 106-PG or 206-PG main valve.

The pilot valve senses the downstream pressure through a connection at the valve outlet. Under flowing conditions, the pilot reacts to small changes in pressure to control the valve position by modulating the pressure above the diaphragm. The downstream pressure is maintained relatively steady at the pilot set-point. The solenoid shut-off / override interrupts the PR function to close off the main valve. The valve is available as either normally open where the solenoid is energized to close the main valve or as normally closed where the solenoid is de-energized to close the main valve.

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