Vent Valve

产品概况：

In order to prevent or minimize the opportunity for vent lines to become filled with fuel, float actuated vent valves are often installed that close the vent lines when fuel is present. The float is normally in the open position when the fluid is in the tank is below a certain level. As fuel rises in the tank, the float swings up due to buoyancy forces until the poppet mates against the housing. Parker has designed several float valves that look similarly to the one pictured.

The material and finishes used in the construction of the valve and those of similar, previously qualified valves are unaffected by several environmental conditions listed in RTCA DO-160 and MIL-STD-810. This elegantly simple design is extremely reliable and several variations of this valve have been produced by Parker for over 30 years.

Float vent valves such as the one above are mounted to a vertical rib, but variations of the design shown have been mounted to a horizontal plane. Due to the increasing demands in aerospace, several float vent valves have also been designed to handle windmilling and engine blade out requirements as well as external Icing.

The material of the float is based off a proprietary polyurethane foam material. The density of the material can be altered for design purposes and is molded around the arm, thus eliminating the need for a secondary mechanical attachment. The material is designed to withstand several types of aerospace fluids and can withstand a variety of high temperature and pressure conditions without degradation. With its low pressure drop and low leakage rate, this valve is an ideal choice when properly selected for the right application.

APPLICATIONS:
The vent valve is used on commercial aircraft, military fighters and transports, business, and general aviation.

FEATURES AND ATTRIBUTES:
Fundamental features of the Vent Valve include the following:
• Able to withstand a variety of vibration levels
• Less than one lb.
• Excellent pressure drop characteristics
• Able to survive extreme temperatures and has a long-proven history to be able to withstand various types of aircraft fluids without any degradation in performance

OPTIONAL FEATURES:
This valve comes in a variety of line sizes. Please see a Parker sales associate for your specific needs.

性能特点：

干重（磅）		0.71 lbs
温度系数(F)		-58ºF to 131ºF fluid temperature
内部泄漏率		5 cc/min max with poppet submerged under 2 inches of fuel
操作压力（psig)		0 to 5 psig
证明压力		12 psig
爆破压力 (psi)		24 psig
开启压力(psi)		0.65 psid minimum (when valve is initially closed and float is submerged
循环寿命		80,000 cycles