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

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

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

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

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

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.

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

KEY FEATURES

+ Maintains stable flow right down to zero

+ Precise and reliable pressure setting

+ By-pass piped in parallel to reduce space requirements

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

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