It has similar features to the globe valve and is often used together with globe valve. It has a load loss resulting from the abrupt change suffered by the fluid, and by the need to raise the pressure of the fluid and providing the obturator opening the valve.

Horizontal retention valves are used in high-speed flow lines for air, gas, liquid and vapor are not recommended for fluid with high solids content suspension. For high viscosity fluids, the ball obturators are the most recommendable.

Retention valve type "Y" Driven by Spring

Also known as straight pass valve or type "Y", have the same characteristics of globe valves, except in body configuration where the seat, and consequently the shutter is in oblique position the inlet and axially arranged exit. This construction provides a lower load loss relative to the globe type.

Vertical Retention Valve

Seu principio de funcionamento é idêntico ao descrito anteriormente. Porém, a válvula se posiciona verticalmente, e o obturador se alinha axialmente com as conexões de entrada e saída, o que não impõe mudança na direção do fluxo. Assim, a perda de carga sofrida pelo fluido é menor do que a acarretada pela execução da horizontal.

Door Wing Retention Valve

Usually presents as a disk obturator (door wing) attached to the end of an articulated rod, piloted by an upwardly axis parallel to the valve seat. The flow obstruction occurs when fluid does not have enough pressure to keep the door wing open (reversal of trend in the direction of flow). This constructive kind brings minimal pressure drop and is recommended to be used in conjunction with free passage valves. Retention Wing Door is indicated to operate in liquid lines, gases and saturated steam, subject to minor trends reverse flow direction, in order to prevent vibration which could cause such trends for fluid flow, in this constructive type. Not recommended for pulsating flows and/or high flow velocity.

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