高壓清洗機(jī)的PA調(diào)壓閥起到安全裝置的作用。PA調(diào)壓閥控制從高壓泵中流出的水流方向。容積高壓柱塞水泵始終輸送水，無(wú)論噴槍是打開(kāi)還是關(guān)閉。當(dāng)噴槍關(guān)閉時(shí)，PA調(diào)壓閥將水流重新引導(dǎo)回高壓水泵的入口側(cè)。這樣可以防止危險(xiǎn)的高壓積聚，并防止零部件失效。高壓清洗設(shè)備安裝有被困壓力卸料器或流量驅(qū)動(dòng)卸料器。
噴槍啟動(dòng)、停止和引導(dǎo)高壓清洗機(jī)噴嘴中的水流。擠壓扳機(jī)釋放壓力。松開(kāi)扳機(jī)會(huì)中斷流向噴嘴的水流，盡管高壓柱塞泵繼續(xù)運(yùn)行。如果沒(méi)有釋放這些水的出口，壓力會(huì)繼續(xù)增加。將導(dǎo)致非常危險(xiǎn)的情況。
The pressure cleaner's unloader valve functions as a safety device. Unloader valves control the direction of the flow of water exiting the pump. A positive displacement pump always delivers water, regardless of whether the spray gun is open or closed. When the spray gun is closed, the unloader valve redirects the flow of water back to the inlet side of the pump. This prevents the build up of dangerously high pressure and guards against the failure of component parts. Pressure cleaners are installed with either a Trapped Pressure Unloader or a Flow Actuated Unloader.
Spray guns start, stop, and direct the flow of water from the pressure washer’s nozzle. Squeezing the trigger releases pressure. Releasing the trigger interrupts the flow of water to the nozzle, although the pump continues to run. Without an outlet for releasing this water, pressure would continue to build. A very dangerous situation would result. PA調(diào)壓閥
PA調(diào)壓閥充當(dāng)壓力調(diào)節(jié)器，在壓力清潔器系統(tǒng)中引導(dǎo)水流。當(dāng)水停止從噴槍噴嘴流出時(shí)，PA調(diào)壓閥會(huì)將其重定向到安全的壓力出口。當(dāng)清潔器處于“旁路模式”時(shí)，噴槍未釋放的水被轉(zhuǎn)移回壓力高壓柱塞泵的入口側(cè)。然后，它通過(guò)高壓水泵循環(huán)并返回PA調(diào)壓閥的入口側(cè)。水再次通過(guò)噴槍釋放，或重定向到高壓柱塞水泵。通過(guò)高壓泵繼續(xù)循環(huán)水的過(guò)程稱為“循環(huán)”。
The Unloader Valve
Unloader valves function as “traffic cops” and pressure regulator that direct the flow of water in a pressure washer system. When water stops flowing from the nozzle of a spray gun, the unloader valve redirects it for a safe pressure outlet. When the cleaner is in “bypass mode,” water that is not released by the spray gun is diverted back to the inlet side of the pressure pump. It then circulates through the pump and back to the inlet side of the unloader valve. Water is once again either released via the spray gun, or redirected to the pump. The process of continued re-cycling of water through the pump is called “cycling.” •“截留壓力”PA調(diào)壓閥是*常用的。這些閥門通過(guò)在高壓柱塞泵輸出端建立壓力來(lái)感應(yīng)并激活。截留壓力閥啟動(dòng)旁路模式，直接響應(yīng)高壓柱塞水泵輸出和噴槍之間軟管中的建筑壓力。它們通常簡(jiǎn)稱為“壓力”閥。當(dāng)循環(huán)中斷時(shí)，會(huì)產(chǎn)生壓力峰值，滯留壓力閥將水重新釋放到噴槍中。操作人員應(yīng)做好噴槍或噴槍桿上的“反沖”效應(yīng)的準(zhǔn)備，以免失控或受傷。
•“Trapped Pressure” unloader valves are the most commonly used. These valves sense and are activated by building pressure at the pump output. Trapped Pressure valves initiate bypass mode in direct response to building pressure in the hose between the pump output and the spray gun. They are often simply called “Pressure” valves. A spike of pressure results when cycling is interrupted and Trapped Pressure valves re-release water to the spray gun. Operators should be prepared for the “kickback” effect on the spray gun or wand to avoid loss of control or injury. •“流量驅(qū)動(dòng)”PA調(diào)壓閥響應(yīng)流向噴嘴的水流中斷。這些閥門可感應(yīng)到從閥門到噴槍的流量減少，并啟動(dòng)旁路回路作為響應(yīng)。與截留壓力閥不同，沒(méi)有壓力被捕獲，因此當(dāng)水重新釋放時(shí)不會(huì)發(fā)生“反沖”。使用流量驅(qū)動(dòng)PA調(diào)壓閥時(shí)，操作員無(wú)法通過(guò)減小噴嘴的孔口尺寸來(lái)調(diào)節(jié)壓力。流量驅(qū)動(dòng)閥檢測(cè)流量損失，并通過(guò)反復(fù)循環(huán)做出反應(yīng)。
•“Flow Actuated” unloader valves respond to the interruption of water flow to the nozzle. These valves sense any decrease in flow from the valve to the spray gun and initiate the bypass loop in response. Unlike Trapped Pressure valves, no pressure is trapped, so no “kick back” occurs when water is re-released. With Flow Actuated unloader valves, operators cannot regulate pressure by downsizing the orifice size of nozzles. Flow Actuated valves detect the loss in flow, and react by cycling repeatedly. 雖然循環(huán)可以防止危險(xiǎn)的壓力積聚，但在旁路模式下會(huì)出現(xiàn)額外的安全問(wèn)題。高壓泵中的運(yùn)動(dòng)部件會(huì)產(chǎn)生摩擦和熱量，這些摩擦和熱量會(huì)傳遞到旁路的水流中。循環(huán)水可以迅速加熱到危險(xiǎn)溫度，因?yàn)樵谂月愤^(guò)程中沒(méi)有冷水進(jìn)入高壓水泵。
Although cycling prevents the dangerous buildup of pressure, added safety concerns arise during bypass mode. Moving parts in the pump create friction and heat which is transferred to the water flow in bypass. Cycling water can quickly be heated to dangerous temperatures as no cool water enters the pump during bypass. 大多數(shù)高壓清洗機(jī)高壓柱塞泵可以承受 140º F 的溫度。在較高的溫度下，可能會(huì)損壞高壓泵。高壓柱塞水泵填料、柱塞、密封件，甚至外部旁路系統(tǒng)中的短旁路軟管都可能損壞。散熱閥提供一些保護(hù)，防止過(guò)多的熱量積聚。它們確保當(dāng)溫度超過(guò) 145º F 時(shí)將冷水釋放到高壓水泵中。
Most pressure washer pumps can withstand temperatures of 140º F. At higher temperatures, damage to the pump can occur. Pump packings, plungers, seals, and even the short bypass hose in external bypass systems may be damaged. Thermal Relief Valves offer some protection against excessive heat buildup. They ensure cool water is released to the pump when temperatures exceed 145º F. PA調(diào)壓閥
PA調(diào)壓閥 -22MPa-3130psi
PA調(diào)壓閥 -32 MPa-4550 psi
PA調(diào)壓閥 -42 MPa-5975 psi
PA調(diào)壓閥 -110 MPa-16000 psi
安全閥
壓力調(diào)節(jié)閥
壓力調(diào)節(jié)閥 - 壓縮空氣控制
流量調(diào)節(jié)閥 - 調(diào)節(jié)閥
PA Valves
PA Unloader valves -22MPa-3130psi
PA Unloader valves -32 MPa-4550 psi
PA Unloader valves -42 MPa-5975 psi
PA Unloader valves -110 MPa-16000 psi
Relief valves
Pressure regulating valves
Pressure regulating valves - compressed air control
Flow regulator valves - Regulator valves PA調(diào)壓閥是確保往復(fù)式高壓泵有效、高效運(yùn)行的一個(gè)小而重要的部件。
An unloader valve is a small and essential part that ensures the effective, efficient operation of a high pressure pump. 什么是PA調(diào)壓閥？
高壓泵PA調(diào)壓閥是一個(gè)很小的零件，通常尺寸在 4到5英寸之間。閥門從高壓泵箱內(nèi)釋放滯留的水，從而使電機(jī)重新啟動(dòng)。如果PA調(diào)壓閥無(wú)法釋放水，積聚的壓力可能會(huì)阻止電機(jī)啟動(dòng)。
高壓水泵的閥門類型取決于機(jī)器的品牌和尺寸。有些通過(guò)設(shè)備壓力開(kāi)關(guān)側(cè)面的撥動(dòng)開(kāi)關(guān)進(jìn)行操作。其他的則在壓力開(kāi)關(guān)下方安裝了一個(gè)整體閥。
What Is an Unloader Valve?
A high pressure pump unloader valve is a small part, usually sized between 4 and 5 inches. The valve releases trapped water from inside the high pressure triplex plunger pump’s tank, which allows the motor to restart. If the unloader valve cannot release the water, the built-up pressure might prevent the motor from starting.
An water high pressure pump’s valve type depends on the machine’s make and size. Some operate via a toggle switch on the side of the unit’s pressure switch. Others have an integral valve installed under the pressure switch. PA調(diào)壓閥的用途是什么？
在典型的往復(fù)式高壓柱塞泵運(yùn)行期間，機(jī)器的電動(dòng)機(jī)驅(qū)動(dòng)水箱充滿水。該設(shè)備包含一個(gè)壓力開(kāi)關(guān)，該開(kāi)關(guān)通過(guò)關(guān)閉電機(jī)的電源來(lái)響應(yīng)水積聚。連接到電機(jī)軸的高壓泵泵也停止。
當(dāng)電機(jī)嘗試重新啟動(dòng)時(shí)，滯留的水會(huì)產(chǎn)生限制其開(kāi)啟能力的負(fù)載。通過(guò)排出水，PA調(diào)壓閥*大限度地減少了活塞上的負(fù)載，從而促進(jìn)了重新供電過(guò)程。
What Is the Purpose of an Unloader Valve?
During the operation of a typical reciprocating water high pressure triplex plunger pump, the machine’s electric motor-driven tank fills with water. The device contains a pressure switch that responds to water accumulation by shutting off the motor’s power supply. The high pressure triplex plunger pump pump, which is attached to the motor shaft, also stops.
When the motor tries to restart, the trapped water produces a load that restricts its ability to switch on. By venting the water, the unloader valve minimizes the load across the piston, which encourages the repowering process. PA調(diào)壓閥位于何處？
PA調(diào)壓閥位于小型往復(fù)式高壓柱塞泵壓力開(kāi)關(guān)的頂部或內(nèi)部。當(dāng)開(kāi)關(guān)關(guān)閉高壓泵時(shí)，它會(huì)啟動(dòng)閥門。一根小管子或一根管子從止回閥（一種防止整個(gè)儲(chǔ)罐排空的裝置）延伸到PA調(diào)壓閥。
較大的高壓柱塞泵通常包含較大的PA調(diào)壓閥。它由較小的先導(dǎo)閥釋放的水壓控制。在這種布置中，閥門通常位于高壓泵旁邊。
Where Is the Unloader Valve Located?
Unloader valves are located on top of or inside the pressure switch in smaller reciprocating water high pressure triplex plunger pumps. When the switch shuts the high pressure triplex plunger pump off, it actuates the valve. A small tube or pipe runs from the check valve — a device that keeps the entire tank from draining — to the unloader valve.
A larger water high pressure triplex plunger pump usually contains a larger unloader valve. It’s controlled by water pressure that’s released from a smaller pilot valve. In this arrangement, the valve typically sits next to the high pressure triplex plunger pump. PA調(diào)壓閥如何工作？
當(dāng)高壓泵水箱內(nèi)的水壓達(dá)到無(wú)法輸送更多水的程度時(shí)，閥門開(kāi)關(guān)會(huì)自動(dòng)中斷電機(jī)的電源供應(yīng)。電源關(guān)閉后，PA調(diào)壓閥打開(kāi)并排出積聚的水。
當(dāng)水箱壓力回落到壓力開(kāi)關(guān)上的預(yù)定設(shè)置時(shí)，會(huì)導(dǎo)致開(kāi)關(guān)再次跳閘。該動(dòng)作導(dǎo)致PA調(diào)壓閥的銷松開(kāi)，防止壓縮水逸出到大氣中。
How Does an Unloader Valve Work?
When the water pressure within the high pressure triplex plunger pump tank arrives at the point where it cannot deliver any more water, the valve switch automatically disrupts the power supply to the motor. After the power supply turns off, the unloader valve opens and vents the accumulated water.
When the tank pressure drops back down to the predetermined setting on the pressure switch, it causes the switch to trip again. This action results in the release of the unloader valve’s pin, preventing the escape of compressed water into the atmosphere. 如何更換PA調(diào)壓閥
PA調(diào)壓閥故障是導(dǎo)致高壓泵無(wú)法正常運(yùn)行的*常見(jiàn)問(wèn)題之一。當(dāng)水無(wú)法從儲(chǔ)罐中逸出時(shí)，積聚的壓力通常會(huì)阻礙設(shè)備重新啟動(dòng)的能力。
當(dāng)PA調(diào)壓閥發(fā)生故障時(shí)，它變得無(wú)法打開(kāi)或關(guān)閉。打開(kāi)的閥門釋放出連續(xù)的泄漏水流。關(guān)閉的閥門會(huì)導(dǎo)致明顯的壓力積聚，從而限制泵的內(nèi)部組件。當(dāng)內(nèi)部部件無(wú)法移動(dòng)時(shí)，這會(huì)阻止發(fā)動(dòng)機(jī)軸打開(kāi)。
您應(yīng)該盡快更換有故障的卸荷閥，以免它們影響其他關(guān)鍵高壓泵部件。在下面了解有關(guān)如何更換PA調(diào)壓閥的更多信息。
How to Replace an Unloader Valve
A malfunctioning unloader valve is one of the most common issues that prevents a high pressure triplex plunger pump from operating properly. When the water cannot escape from the tank, the built-up pressure often hinders the unit’s ability to restart.
When the unloader valve malfunctions, it becomes unable to open or close. Open valves release a continuous stream of leaking water. Closed valves result in significant pressure buildups that can restrict the pump’s internal components. When the interior components can’t move, this prevents the engine shaft from opening.
You should replace faulty unloader valves as soon as possible before they impact other critical high pressure triplex plunger pump components. Learn more about how to replace an unloader valve below. 開(kāi)始需要什么
各種高壓水泵都有不同類型的PA調(diào)壓閥。無(wú)論您是使用壓力控制器側(cè)面的撥動(dòng)開(kāi)關(guān)，還是直接安裝在裝置上的閥門，這兩種類型都需要相同的材料進(jìn)行更換：
十字螺絲刀或平頭螺絲刀
活動(dòng)扳手
可調(diào)鉗
剪鉗
螺紋潤(rùn)滑劑
新型PA調(diào)壓閥
安全眼鏡
What You Need to Get Started
Various water high pressure triplex plunger pumps have different types of unloader valves. Whether you’re working with a toggle switch on the side of the pressure controller or a valve that mounts directly to the unit, both types require the same materials for replacements:
A Phillips or flathead screwdriver
An adjustable wrench
Adjustable pliers
Snipping pliers
Thread lubricant
The new unloader valve
Safety glasses PA調(diào)壓閥更換步驟
首先，打開(kāi)排水閥給水箱減壓。壓力釋放后，識(shí)別PA調(diào)壓閥。它連接到將水輸送到再循環(huán)泵的軟管上。
接下來(lái)，是時(shí)候拆下舊閥門了。
請(qǐng)按照下列步驟操作：
1.拔下高壓泵插頭。
2.拆下進(jìn)入閥門的管路。
3.如果閥門有，請(qǐng)使用可調(diào)鉗或扳手卸下快速連接接頭。
4.斷開(kāi)壓力開(kāi)關(guān)的電線。
5.拆下閥門。
Unloader Valve Replacement Steps
First, open the drain valve to depressurize the tank. After the pressure releases, identify the unloader valve. It’s connected to a hose that transfers water to the recirculation pump.
Next, it’s time to remove the old valve. Follow these steps:
1.Unplug the high pressure triplex plunger pump.
2.Remove the line going into the valve.
3.Use the adjustable pliers or a wrench to remove the quick-connect fitting if the valve has one.
4.Disconnect the wires from the pressure switch.
5.Detach the valve. 拆下舊閥門后，您可以按照以下說(shuō)明安裝新閥門：
1.在新閥門上涂上螺紋潤(rùn)滑劑。
2.用剪線鉗剪掉少量線，確保連接干凈。
3.連接線路。
4.重新連接快速連接接頭。
5.安裝新閥門。
6.根據(jù)泵制造商規(guī)定的壓力調(diào)整新PA調(diào)壓閥上的張力。
After removing the old valve, you can install the new one with these instructions:
1.Apply thread lubricant to the new valve.
2.Cut a small amount of the line with the snipping pliers to ensure a clean connection.
3.Connect the line.
4.Reattach the quick-connect fitting.
5.Attach the new valve.
6.Adjust the tension on the new unloader valve according to the pump manufacturer’s specified pressure. PA調(diào)壓閥 PA Unloader valves
PA Unloader valves -22MPa-3130psi
VB200-180 ZERO-ZEROED OUTLET PRESSURE, IN BYPASS
VB 200/150-VB200/70
VB 140/160
VB 130 PA UNLOADER VALVE
VB130-VB3-VB7-VB75 PLASTIC KNOB
VB20-160-VB30-220 ZERO-ZEROED OUTLET PRESSURE, IN BYPASS
VB20-160 ZERO WITH MICRO-SWITCH-ZEROED OUTLET PRESSURE, IN BYPASS
PULSAR RV- VALVE 3/8 BSP F - VITON O-RING
VB 450 - 200 - PA UNLOADER VALVE VB 3- PA UNLOADER VALVE
VB 35 - BANJO CONNECTION - HOLLOW SCREW FITTING
VB 35 - BANJO CONNECTION- HOLLOW SCREW FITTING- ADJUST.INJECTOR
VB 5 - PA UNLOADER VALVE
VB 56 - BANJO CONNECTION - HOLLOW SCREW FITTING -OUT. 3/8 BSP F F
VB 56 - BANJO CONNECTION - HOLLOW SCREW FITTING -OUT. 3/8 BSP M
VB 7 - PA UNLOADER VALVE
VB 7 WITH INJECTOR
VB 75 - BANJO CONNECTION - HOLLOW SCREW FITTING
VB 8
VB 8 WITH MICRO-SWITCH-PR5
VB 8 WITH MICRO-SWITCH-PR16
VB 9
VB 9 WITH KNOB AND PANEL FITTING
VB 9 WITH KNOB AND MICRO-SWITCH
VB 10 WITH KNOB
VB 80A/150 - ATEX--AI 303- PA調(diào)壓閥PA Unloader valves -32 MPa-4550 psi
PULSAR ZERO WITH KNOB AND MICRO-SWITCH -ZEROED OUTLET PRESSURE, IN
BYPASS
VB80/280 ZERO - VALVE WITH ZEROED OUTLET PRESSURE, IN BYPASS
VB80/280 ZERO WITH KNOB AND MICRO-SWITCH - VALVE WITH ZEROED OUTLET PRESSURE, IN BYPASS
PULSAR RV - PA UNLOADER VALVE
PULSAR RV - BYPASS VALVE WITH KNOB
PULSAR RV - PA UNLOADER VALVE -NICKEL-PLATED BRASS
PULSAR RV + 1/4 BSP F GAUGE PORT
PULSAR RV WITH KNOB/ GAUGE PORT
PULSAR RV WITH MICRO-SWITCH/ KNOB
PULSAR RV WITH MICRO-SWITCH
PULSAR RV - UNLOA.VAL. WITH EASY STARTER AND KNOB VB 280 WITH KNOB
VB 285 WITH KNOB - BANJO CONNECTION - HOLLOW SCREW FITTING
VB 85/180 - VB 85/310 WITH GAUGE PORT
VB 85 R/180 - VB 85 R/310 --PA UNLOADER VALVE
VB 85 RV/180 - VB 85 RV/310-UNLOADER VALV. WITH KNOB
VB85 RV/310 UNLOA.VAL. WITH MICRO-SWITCH
VB33 - PA UNLOADER VALVE
VB33- HT 28MPA - PA UNLOADER VALVE FOR HOT TEMPERATURE WATER
VB 200/280 - PA UNLOADER VALVE
VB 450 - 300 - PA UNLOADER VALVE
VB 80A/280 - AISI 303 ATEX
VB 80 /150-280 - AISI 316 -VITON O-RINGS
VB 80A/150- 280 ATEX -AISI 316 -VITON O-RINGS
VB 23 - AISI 303 -VITON/EPDM O-RINGS
VB 26 - AISI 316 -VITON O-RINGS- PA UNLOADER VALVE PA調(diào)壓閥PA Unloader valves -42 MPa-5975 psi
PULSAR ZERO - VALVE WITH ZEROED OUTLET PRESSURE, IN BYPASS
VB 350 PA UNLOADER VALVE WITH KNOB
VB 350 S
VB 350 WITH KNOB AND MICROSWITCH
VB 36
VB36- HT 39MPA - PA UNLOADER VALVE FOR HOT TEMPERATURE WATER
VB 80/150 - 280 - 400 - AISI 303
VB 80/150 - 280 - 400 - AISI 303 -VITON O-RINGS
VB 80/280- 400 - NORSOK- UNLOADER VAL. DUPLEX SST - VITON O-RINGS
VB 43 - AISI 303
VB23A-VB26A-VB33A- VB43A - VALV BYPASS ATEX PA調(diào)壓閥PA Unloader valves -110 MPa-16000 psi
VB 16
VB 53 - AISI 303
VB 250/500 - PA UNLOADER VALVE AISI 303
VB 83 - PA UNLOADER VALVE AISI 303
VB60/600-400-250 ZERO - VALVE WITH ZEROED OUTLET PRESSURE, IN BYPASS
VB60/600 ZERO WITH MICRO-SWITCH- VALVE WITH ZEROED OUTLET PRESSURE,IN BYPASS
VB40/1000 ZERO - VALVE WITH ZEROED OUTLET PRESSURE, IN BYPASS
STR -ADJUSTING BYPASS NEEDLE 淺析PA調(diào)壓閥UNLOADLER溢流閥安全閥SAFETY對(duì)高壓泵柱塞水泵清洗機(jī)設(shè)備的重要性
　　淺析閥門對(duì)高壓泵清洗設(shè)備的重要性
隨著高壓柱塞水泵清洗機(jī)的使用領(lǐng)域不斷增大，商場(chǎng)的需要量也不斷增大。
尤其在工業(yè)清洗領(lǐng)域，由于工業(yè)清洗越來(lái)越被我們重視，所以該設(shè)備被廣泛推廣和使用。
當(dāng)前高壓清洗機(jī)已經(jīng)成為工業(yè)清洗領(lǐng)域中首選的清洗設(shè)備，并且逐步向系統(tǒng)化和主動(dòng)化進(jìn)行演化。
而經(jīng)過(guò)對(duì)高壓水發(fā)生設(shè)備進(jìn)行遠(yuǎn)程控制，即可結(jié)束高壓水射流清洗的主動(dòng)化。
　　遠(yuǎn)程主動(dòng)控制PA調(diào)壓閥是由壓力變送器測(cè)量出高壓水發(fā)生設(shè)備的出口壓力，并將測(cè)量值轉(zhuǎn)換為數(shù)字信號(hào)，傳遞給控制系統(tǒng)，控制系統(tǒng)根據(jù)需要宣布指令，啟閉電動(dòng)設(shè)備，電動(dòng)設(shè)備根據(jù)控制系統(tǒng)的指令驅(qū)動(dòng)P.A.調(diào)壓溢流閥，從而結(jié)束高壓水泵清洗設(shè)備的壓力調(diào)度。 定壓溢流作用：在定量泵節(jié)約調(diào)度系統(tǒng)中，定量泵供給的是安穩(wěn)流量。
當(dāng)系統(tǒng)壓力增大時(shí)，會(huì)使流量需要減小。
此時(shí)PA unloader valve打開(kāi)，使剩余流量溢回油箱，確保PA調(diào)壓溢流閥進(jìn)口壓力，即高壓柱塞泵清洗設(shè)備泵出口壓力安穩(wěn)（閥口常隨壓力不堅(jiān)定打開(kāi)）。
　　穩(wěn)壓作用：PA調(diào)壓閥串聯(lián)在回油路上， PA溢流閥發(fā)生背壓，運(yùn)動(dòng)部件平穩(wěn)性增加。
系統(tǒng)卸荷作用：在P.A.PA調(diào)壓閥的遙控口串接溢小流量的電磁閥，當(dāng)電磁鐵通電時(shí)，PA unloader valve的遙控口通油箱，此時(shí)液壓泵卸荷。
PA調(diào)壓閥此時(shí)作為卸荷閥運(yùn)用。
　　安全保護(hù)作用：高壓泵清洗機(jī)系統(tǒng)正常工作時(shí)，閥門關(guān)閉。只需負(fù)載逾越規(guī)則的極限時(shí)打開(kāi)溢流，進(jìn)行過(guò)載保護(hù)，使系統(tǒng)壓力不再增加。
　　高壓水泵清洗設(shè)備之所以能夠在額定工作壓力下的任意工作壓力工作，都是PA調(diào)壓閥在發(fā)揮作用。PA調(diào)壓閥是確保和結(jié)束這一工作的重要調(diào)度組織。
由于大多數(shù)的清洗機(jī)配備的高壓水發(fā)生設(shè)備都?xì)w于定流量容積泵，所以在額定工作壓力以下的任意壓力工作時(shí)，都會(huì)伴跟著溢流。
而PA調(diào)壓閥是能夠一起結(jié)束高壓清洗機(jī)高壓水發(fā)生設(shè)備調(diào)壓和溢流的設(shè)備，即稱為P.A. unloader valve。 Relief valves
VS 30
VS 100 - AISI 316 - VITON O-RINGS
VS 160
VS 450-200
VS 140 - VS 240
VS 170 - VS 220 -1 INLET PORT
VS 170 - VS 220 - 2 INLET PORTS
VS 200/200
VS 28 / 1 - 2 – 3
VS 28 / 1 - 2 PRESSURE ADJUSTED
VS 80/150 - AISI 303 ATEX
VS 80/150-280 AISI 316 - VITON O-RINGS-ATEX
VS 23 AI303- VS23- DUPLEX VS 26 - AISI 316 - VITON O-RINGS VS 450-300
VS 310 -1 INLET PORT
VS 350
VS 360
VS 24 - VS 43 - AISI 303
VS 26A - VS 43A – ATEX
VS 80/400 - AISI 303 – ATEX
VS 80/280-400 - NORSOK -SST. DUPLEX - VITON O-RINGS
VS 500-VS 500/310
VS 500- PRESSURE ADJUSTED VALVE
VS 500- SST
VS 660
VS 1100
"VS 1200 FL" POP-OFF VALVE 泄壓閥
泄壓閥又名 安全閥（safety valve）根據(jù)系統(tǒng)的工作壓力能自動(dòng)啟閉，一般安裝于封閉系統(tǒng)的設(shè)備或管路上保護(hù)系統(tǒng)安全。當(dāng)設(shè)備或管道內(nèi)壓力超過(guò)泄壓閥設(shè)定壓力時(shí)，即自動(dòng)開(kāi)啟泄壓，保證設(shè)備和管道內(nèi)介質(zhì)壓力在設(shè)定壓力之下，保護(hù)設(shè)備和管道，防止發(fā)生意外。
編輯本段分類泄壓閥結(jié)構(gòu)主要有兩大類：彈簧式和杠桿式。彈簧式是指閥瓣與閥座的密封靠彈簧的作用力。杠桿式是靠杠桿和重錘的作用力。隨著大容量的需要，又有一種脈沖式泄壓閥，也稱為先導(dǎo)式泄壓閥，由主泄壓閥和輔助閥組成。當(dāng)管道內(nèi)介質(zhì)壓力超過(guò)規(guī)定壓力值時(shí)，輔助閥先開(kāi)啟，介質(zhì)沿著導(dǎo)管進(jìn)入主泄壓閥，并將主泄壓閥打開(kāi)，使增高的介質(zhì)壓力降低。 操作方法泄壓閥開(kāi)啟壓力的調(diào)整
1、泄壓閥出廠前，應(yīng)逐臺(tái)調(diào)整其開(kāi)啟壓力到用戶要求的整定值。若用戶提出彈簧工作壓力級(jí)，則按一般應(yīng)按壓力級(jí)的下限值調(diào)整出廠。
2、使用者在將泄壓閥安裝到被保護(hù)設(shè)備上之前或者在安裝之前，必須在安裝現(xiàn)場(chǎng)重新進(jìn)行調(diào)整，以確保泄壓閥的整定壓力值符合要求。
3、在銘牌注明的彈簧工作壓力級(jí)范圍內(nèi)，通過(guò)旋轉(zhuǎn)調(diào)整螺桿改變彈簧壓縮量，即可對(duì)開(kāi)啟壓力進(jìn)行調(diào)節(jié)。
4、在旋轉(zhuǎn)調(diào)整螺桿之前，應(yīng)使閥進(jìn)口壓力降低到開(kāi)啟壓力的 90%以下，以防止旋轉(zhuǎn)調(diào)整螺桿時(shí)閥瓣被帶動(dòng)旋轉(zhuǎn)，以致?lián)p傷密封面。
5、為保證開(kāi)啟壓力值準(zhǔn)確，應(yīng)使調(diào)整時(shí)的介質(zhì)條件，如介質(zhì)種類、溫度等盡可能接近實(shí)際運(yùn)行條件。介質(zhì)種類改變，特別是當(dāng)介質(zhì)聚積態(tài)不同時(shí)（例如從液相變?yōu)闅庀啵�，開(kāi)啟壓力常有所變化。工作溫度升高時(shí)，開(kāi)啟壓力一般有所降低。故在常溫下調(diào)整而用于高溫時(shí)，常溫下的整定壓力值應(yīng)略高于要求的開(kāi)啟壓力值。高到什么程度與閥門結(jié)構(gòu)和材質(zhì)選用都有關(guān)系，應(yīng)以制造廠的說(shuō)明為根據(jù)。
6、常規(guī)泄壓閥用于固定附加背壓的場(chǎng)合，當(dāng)在檢驗(yàn)后調(diào)整開(kāi)啟壓力時(shí)（此時(shí)背壓為大氣壓），其整定值應(yīng)為要求的開(kāi)啟壓力值減去附加背壓值。 特點(diǎn)1、準(zhǔn)確且保持不變的安全穩(wěn)定壓力，一旦超壓，泄壓閥能充分打開(kāi)及時(shí)泄壓。
2、關(guān)閉速度可調(diào)，消除壓力波動(dòng)。
3、隔膜傳動(dòng)機(jī)構(gòu)將操作滯后現(xiàn)象減小到*小。
4、它可安裝在任何位置，不用改變壓力設(shè)定值或從管路上拆除就可進(jìn)行維修和檢查。
Pressure regulating valves
VRP 175
VRP 450-200
VRP 200
VRP 280
VRP 26 - AISI 316 - VITON O-RINGS
VRP 450-300
VRP 350
VRP 23 - VRP 43 - AISI 303
VRP 600 Pressure regulating valves - compressed air control
VRPP 170 AIR-CONTROLLED
VRPP 450-200 AIR-CONTROLLED
VRPP 33 - HT AIR-CONTROLLED
VRPP 26 - AISI316 AIR-CONTROLLED
VRPP 200-280 AIR-CONTROLLED
VRPP 600 - AISI 303 AIR-CONTROLLED

注：本文字介紹中的圖片僅供參考，不予文字內(nèi)容一一準(zhǔn)確對(duì)應(yīng)，具體以實(shí)物為準(zhǔn)。