產品描述 Product Description

進口水減壓閥(水力調節閥)在需要減靜壓和動壓的場合可以取代中間水箱，閥體采用了全通道流線型設計，流體阻力小，流量大。在轉動方式上采用了水力操作，即利用管路中的進出口水壓差自動操作主閥瓣的上下移動，控制閥口開度，調節下游壓力，使下游壓力維持在導閥彈簧設定的壓力值上。當下游壓力超過設定值時，減壓閥將自動關閉，不管入口壓力怎樣波動，都可輸出穩定的出口壓力。不管下游流量怎樣變化，都能維持出口壓力穩定在導閥設定值上。同時通過導閥調節的出口壓力調節范圍大，可達閥前壓力10-80%，且工作平衡，無水錘沖出現象。

The inlet water pressure reducing valve (hydraulic control valve) can replace the middle water tank in the situation where static pressure and dynamic pressure need to be reduced. The valve body adopts the full channel streamline design, with small fluid resistance and large flow. In terms of rotation, hydraulic operation is adopted, which utilizes the water pressure difference between the inlet and outlet in the pipeline to automatically operate the up and down movement of the main valve disc, control the valve opening, adjust the downstream pressure, and maintain the downstream pressure at the pressure value set by the guide valve spring. When the downstream pressure exceeds the set value, the pressure reducing valve will automatically close, and regardless of how the inlet pressure fluctuates, it can output stable outlet pressure. No matter how the downstream flow changes, the outlet pressure can be maintained stable at the set value of the pilot valve. At the same time, the outlet pressure regulated by the pilot valve has a large adjustment range, reaching 10% -80% of the front pressure of the valve, and the work is balanced without water hammer impact.

結構和主要零件材質 Structure and main component materials

結構形式為液控截止形式，按不同口徑采用橡膠膜片和活塞式連接閥蓋瓣開啟、關閉的形式 The structure is in the form of hydraulic control cut-off, with rubber diaphragm and piston type connection valve cover disc opening and closing according to different diameters

水減壓閥由主閥、導閥、針閥、球閥、微型過濾器和壓力表等組成，由于導閥、針閥和壓力表等要用外接導管與主閥相連接The water pressure reducing valve is composed of a main valve, a guide valve, a needle valve, a ball valve, a micro filter, and a pressure gauge. As the guide valve, needle valve, and pressure gauge need to be connected to the main valve through an external conduit

主要零件材質 Main component materials

工作原理

進口水減壓閥分隔膜式和活塞式兩大類，RETZ提供的口徑DN350以下的采用隔膜式，DN400以上的采用活塞式，兩種形式的動作原理相同：進口壓力P1通過導管和針閥（參看結構圖）進入主閥的控制室，并建立向下的壓力P3。出口壓力P2也通過導管作用在導閥的膜片（或活塞）下并與導閥的調節彈簧相對抗。當下游壓力超過導閥彈簧設定值時，導閥關閉，控制室內水不能排出，可變壓力P3達到最大值，則主閥瓣壓緊閥座，使減壓閥關閉。一旦下游壓力P2降到導閥彈簧設定值時，導閥開啟，控制室內的壓力水將通過導閥、球閥排泄到下游。由于針閥開度小，并且入口導管比出口導管直徑小，所以排泄速度大于入口壓力補水速度，由此控制室內的壓力P3減小，一直作用在主閥瓣下面的入口壓力P1將主閥瓣托起，從而打開減壓閥。在移定調節狀態，排泄流量等于補水流量，主閥口開度不變，下游壓力穩定。

RETZ The inlet water pressure reducing valve is divided into two categories: diaphragm type and piston type. RETZ provides diaphragm type for diameters below DN350, and piston type for diameters above DN400. The action principle of both forms is the same: the inlet pressure P1 enters the control room of the main valve through a conduit and needle valve (see structural diagram), and a downward pressure P3 is established. The outlet pressure P2 also acts on the diaphragm (or piston) of the pilot valve through a conduit and opposes the regulating spring of the pilot valve. When the downstream pressure exceeds the set value of the pilot valve spring, the pilot valve closes, and the water in the control room cannot be discharged. When the variable pressure P3 reaches its maximum value, the main valve disc presses against the valve seat, causing the pressure reducing valve to close. Once the downstream pressure P2 drops to the set value of the pilot valve spring, the pilot valve opens, and the pressure water in the control room will be discharged downstream through the pilot valve and ball valve. Due to the small opening of the needle valve and the smaller diameter of the inlet duct compared to the outlet duct, the discharge velocity is greater than the inlet pressure replenishment velocity. As a result, the pressure P3 in the control room decreases. The inlet pressure P1, which has been acting below the main valve disc, lifts the main valve disc and opens the pressure reducing valve. In the adjustable state, the discharge flow is equal to the make-up water flow, the opening of the main valve remains unchanged, and the downstream pressure is stable.

關閉狀態：當主閥進口端水壓分別進入閥體及控制室，且主閥的外部球閥同時關閉，此時主閥處于關閉狀態。

Fully closed state: When the water pressure at the inlet end of the main valve enters the valve body and control room respectively, and the external ball valve of the main valve is closed at the same time, the main valve is in a fully closed state

開啟狀態：當主閥外部的球閥全開后，此時控制室內水壓全部釋放到管路下游，而主閥也呈現為開啟狀態。

Fully open state: When the ball valve outside the main valve is fully open, all the water pressure in the control room is released to the downstream of the pipeline, and the main valve also shows a fully open state

浮動調節狀態：調節主閥外部的球閥開度，使進水端流向控制室的水流和控制室流向下游的水流達到平衡，此時主閥處于調節浮動狀態。

Floating adjustment state: Adjust the opening of the ball valve outside the main valve to balance the water flow from the inlet end to the control room and the water flow from the control room to the downstream. At this time, the main valve is in the floating adjustment state

流量示意圖 Flow diagram

安裝與調試 Installation and debugging

安裝

1、主閥最佳安裝方式是水平臥式安裝，閥蓋朝上，其它安裝方式也可達到操作功能；

2、通水前須（利用旁通管或其他措施）沖洗管路系統，清除施工雜質；

3、要求在閥前安裝Y形過濾器，并定期清洗（半年至一年）；

4、最好水平方向安裝，閥蓋朝上，如垂直安裝，壽命比水平安裝稍短；

5、當減壓比大于4：1時，建議二級串聯減壓，減少氣蝕，延長壽命；

6、旁通管隔離閥須關閉嚴密，建議選用進口蝶閥或截止閥。

2調試

導閥與導管控制系統已于出廠前裝配和調整完畢，如導閥出廠設定壓力值不適合現場要求可作如下調整：

1、先松開導閥的保險蓋，然后將導閥的調節螺桿退擰至最上位置（相對出口最低壓力）。

2、再慢慢順時針擰動導閥的調節螺桿，出口壓力將逐漸升高直到設定值為止。后裝上保險蓋。

3、同時要調節針閥開度，使水流經過針閥和導閥的水流達到平衡，此時下游壓力達到更穩（順時針擰動針閥手輪為減少開度，逆時針為增加開度）。

4、調整過頭，須從第一步開始重調，即只能從低壓往高壓調。