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高壓清洗機的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，無論噴槍是打開還是關(guān)閉。當噴槍關(guān)閉時，PA調(diào)壓閥將水流重新引導回高壓水泵的入口側(cè)。這樣可以防止危險的高壓積聚，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)動卸料器。
噴槍啟動、停止和引導高壓清洗機噴嘴中的水流。擠壓扳機釋放壓力。松開扳機會中斷流向噴嘴的水流，盡管高壓柱塞泵繼續(xù)運行。如果沒有釋放這些水的出口，壓力會繼續(xù)增加。將導致非常危險的情況。
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)壓閥充當壓力調(diào)節(jié)器，在壓力清潔器系統(tǒng)中引導水流。當水停止從噴槍噴嘴流出時，PA調(diào)壓閥會將其重定向到安全的壓力出口。當清潔器處于“旁路模式”時，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)。水再次通過噴槍釋放，或重定向到高壓柱塞水泵。通過高壓泵繼續(xù)循環(huán)水的過程稱為“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。這些閥門通過在高壓柱塞泵輸出端建立壓力來感應(yīng)并激活。截留壓力閥啟動旁路模式，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。它們通常簡稱為“壓力”閥。當循環(huán)中斷時，會產(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”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，并啟動旁路回路作為響應(yīng)。與截留壓力閥不同，沒有壓力被捕獲，因此當水重新釋放時不會發(fā)生“反沖”。使用流量驅(qū)動PA調(diào)壓閥時，操作員無法通過減小噴嘴的孔口尺寸來調(diào)節(jié)壓力。流量驅(qū)動閥檢測流量損失，并通過反復循環(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)可以防止危險的壓力積聚，但在旁路模式下會出現(xiàn)額外的安全問題。高壓泵中的運動部件會產(chǎn)生摩擦和熱量，這些摩擦和熱量會傳遞到旁路的水流中。循環(huán)水可以迅速加熱到危險溫度，因為在旁路過程中沒有冷水進入高壓水泵。
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)高壓清洗機高壓柱塞泵可以承受 140º F 的溫度。在較高的溫度下，可能會損壞高壓泵。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，防止過多的熱量積聚。它們確保當溫度超過 145º F 時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)壓閥是確保往復式高壓泵有效、高效運行的一個小而重要的部件。
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，從而使電機重新啟動。如果PA調(diào)壓閥無法釋放水，積聚的壓力可能會阻止電機啟動。
高壓水泵的閥門類型取決于機器的品牌和尺寸。有些通過設(shè)備壓力開關(guān)側(cè)面的撥動開關(guān)進行操作。其他的則在壓力開關(guān)下方安裝了一個整體閥。
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？
在典型的往復式高壓柱塞泵運行期間，機器的電動機驅(qū)動水箱充滿水。該設(shè)備包含一個壓力開關(guān)，該開關(guān)通過關(guān)閉電機的電源來響應(yīng)水積聚。連接到電機軸的高壓泵泵也停止。
當電機嘗試重新啟動時，滯留的水會產(chǎn)生限制其開啟能力的負載。通過排出水，PA調(diào)壓閥*大限度地減少了活塞上的負載，從而促進了重新供電過程。
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)壓閥位于小型往復式高壓柱塞泵壓力開關(guān)的頂部或內(nèi)部。當開關(guān)關(guān)閉高壓泵時，它會啟動閥門。一根小管子或一根管子從止回閥（一種防止整個儲罐排空的裝置）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？
當高壓泵水箱內(nèi)的水壓達到無法輸送更多水的程度時，閥門開關(guān)會自動中斷電機的電源供應(yīng)。電源關(guān)閉后，PA調(diào)壓閥打開并排出積聚的水。
當水箱壓力回落到壓力開關(guān)上的預(yù)定設(shè)置時，會導致開關(guān)再次跳閘。該動作導致PA調(diào)壓閥的銷松開，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)壓閥故障是導致高壓泵無法正常運行的*常見問題之一。當水無法從儲罐中逸出時，積聚的壓力通常會阻礙設(shè)備重新啟動的能力。
當PA調(diào)壓閥發(fā)生故障時，它變得無法打開或關(guān)閉。打開的閥門釋放出連續(xù)的泄漏水流。關(guān)閉的閥門會導致明顯的壓力積聚，從而限制泵的內(nèi)部組件。當內(nèi)部部件無法移動時，這會阻止發(fā)動機軸打開。
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. 開始需要什么
各種高壓水泵都有不同類型的PA調(diào)壓閥。無論您是使用壓力控制器側(cè)面的撥動開關(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行更換：
十字螺絲刀或平頭螺絲刀
活動扳手
可調(diào)鉗
剪鉗
螺紋潤滑劑
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，打開排水閥給水箱減壓。壓力釋放后，識別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，是時候拆下舊閥門了。
請按照下列步驟操作：
1.拔下高壓泵插頭。
2.拆下進入閥門的管路。
3.如果閥門有，請使用可調(diào)鉗或扳手卸下快速連接接頭。
4.斷開壓力開關(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，您可以按照以下說明安裝新閥門：
1.在新閥門上涂上螺紋潤滑劑。
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對高壓泵柱塞水泵清洗機設(shè)備的重要性
　　淺析閥門對高壓泵清洗設(shè)備的重要性
隨著高壓柱塞水泵清洗機的使用領(lǐng)域不斷增大，商場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)清洗越來越被我們重視，所以該設(shè)備被廣泛推廣和使用。
當前高壓清洗機已經(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)化和主動化進行演化。
而經(jīng)過對高壓水發(fā)生設(shè)備進行遠程控制，即可結(jié)束高壓水射流清洗的主動化。
　　遠程主動控制PA調(diào)壓閥是由壓力變送器測量出高壓水發(fā)生設(shè)備的出口壓力，并將測量值轉(zhuǎn)換為數(shù)字信號，傳遞給控制系統(tǒng)，控制系統(tǒng)根據(jù)需要宣布指令，啟閉電動設(shè)備，電動設(shè)備根據(jù)控制系統(tǒng)的指令驅(qū)動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。
當系統(tǒng)壓力增大時，會使流量需要減小。
此時PA unloader valve打開，使剩余流量溢回油箱，確保PA調(diào)壓溢流閥進口壓力，即高壓柱塞泵清洗設(shè)備泵出口壓力安穩(wěn)（閥口常隨壓力不堅定打開）。
　　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，運動部件平穩(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，當電磁鐵通電時，PA unloader valve的遙控口通油箱，此時液壓泵卸荷。
PA調(diào)壓閥此時作為卸荷閥運用。
　　安全保護作用：高壓泵清洗機系統(tǒng)正常工作時，閥門關(guān)閉。只需負載逾越規(guī)則的極限時打開溢流，進行過載保護，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)的清洗機配備的高壓水發(fā)生設(shè)備都歸于定流量容積泵，所以在額定工作壓力以下的任意壓力工作時，都會伴跟著溢流。
而PA調(diào)壓閥是能夠一起結(jié)束高壓清洗機高壓水發(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)的工作壓力能自動啟閉，一般安裝于封閉系統(tǒng)的設(shè)備或管路上保護系統(tǒng)安全。當設(shè)備或管道內(nèi)壓力超過泄壓閥設(shè)定壓力時，即自動開啟泄壓，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，也稱為先導式泄壓閥，由主泄壓閥和輔助閥組成。當管道內(nèi)介質(zhì)壓力超過規(guī)定壓力值時，輔助閥先開啟，介質(zhì)沿著導管進入主泄壓閥，并將主泄壓閥打開，使增高的介質(zhì)壓力降低。 操作方法泄壓閥開啟壓力的調(diào)整
1、泄壓閥出廠前，應(yīng)逐臺調(diào)整其開啟壓力到用戶要求的整定值。若用戶提出彈簧工作壓力級，則按一般應(yīng)按壓力級的下限值調(diào)整出廠。
2、使用者在將泄壓閥安裝到被保護設(shè)備上之前或者在安裝之前，必須在安裝現(xiàn)場重新進行調(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范圍內(nèi)，通過旋轉(zhuǎn)調(diào)整螺桿改變彈簧壓縮量，即可對開啟壓力進行調(diào)節(jié)。
4、在旋轉(zhuǎn)調(diào)整螺桿之前，應(yīng)使閥進口壓力降低到開啟壓力的 90%以下，以防止旋轉(zhuǎn)調(diào)整螺桿時閥瓣被帶動旋轉(zhuǎn)，以致?lián)p傷密封面。
5、為保證開啟壓力值準確，應(yīng)使調(diào)整時的介質(zhì)條件，如介質(zhì)種類、溫度等盡可能接近實際運行條件。介質(zhì)種類改變，特別是當介質(zhì)聚積態(tài)不同時（例如從液相變?yōu)闅庀啵�，開啟壓力常有所變化。工作溫度升高時，開啟壓力一般有所降低。故在常溫下調(diào)整而用于高溫時，常溫下的整定壓力值應(yīng)略高于要求的開啟壓力值。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)以制造廠的說明為根據(jù)。
6、常規(guī)泄壓閥用于固定附加背壓的場合，當在檢驗后調(diào)整開啟壓力時（此時背壓為大氣壓），其整定值應(yīng)為要求的開啟壓力值減去附加背壓值。 特點1、準確且保持不變的安全穩(wěn)定壓力，一旦超壓，泄壓閥能充分打開及時泄壓。
2、關(guān)閉速度可調(diào)，消除壓力波動。
3、隔膜傳動機構(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)容一一準確對應(yīng)，具體以實物為準。