Frank Lockwood e thehiloe ka 1977 mme ntlo-kholo ea hae e Houston, USA.Frank Lockwood o na le boiphihlelo bo pharaletseng ba li-valve le tsebo ea indasteri ho fa bareki liphaephe tsa boleng, li-valve, li-fittings, li-flanges le tsamaiso ea merero, ho kenyelletsa le moralo, othomathike, QA, joalo-joalo.
Lihlahisoa tsa Frank Lockwood li kenyelletsa li-valve tsa actuator tsa motlakase tse sa sireletsehang, li-actuator tsa motlakase tse sa sebetseng, li-valve tsa motlakase tse timang joalo-joalo.

Flotech e thehiloe ka 1961 mme e thehiloe United States.Flotech esale e holisa mefuta ea eona ea lihlahisoa le lits'ebeletso ho theosa le lilemo ka ho fumana lithuso tse ling.Flotech e ikemiselitse ho fa bareki mefuta e mecha ea li-valve le li-drive, hammoho le litšebeletso tsa tlhokomelo.
Lihlahisoa li na le valve ea bolo ea motlakase, valve ea motlakase ea serurubele, valve ea pneumatic ball le li-valve tse ling tse ikemetseng.

DYNAQUIP Controls e thehiloe ka 1935. Ka lilemo tse fetang 70, ba 'nile ba inehela ho fana ka sehlahisoa se setle le tšebeletso ea bareki bakeng sa indasteri ea oli le khase, lijo le lino, joalo-joalo.Tšebeletso e feto-fetohang ho fihlela litlhoko tsa bareki ba indasteri, ba bolulo le ba khoebo.Sehlahisoa sa sehlahisoa se kenyelletsa valve ea bolo ea othomathike, valve ea serurubele se ikemetseng, actuator ea othomathiki joalo-joalo.

Cr-tec Engineering ke mofani oa thepa ea li-valve tsa motlakase, pneumatic le manual.Lihlahisoa li ka sebelisoa bakeng sa phekolo e fapaneng ea mokelikeli.Litšebeletso tsa oli le khase, Phekolo ea likhoerekhoere, phekolo ea metsi a nooang, limela tsa motlakase, li-automation, ho haha ​​​​likepe, joalo-joalo.
Lihlahisoa li kenyelletsa li-valve tsa motlakase tsa 2-way ball, li-valve tsa motlakase tsa 3-way, le li-valve tse ling tse ikemetseng.

Schneider ke k'hamphani e tsebahalang e nang le lilemo tse fetang 180 tsa nalane e ikemiselitseng ho fana ka litharollo tse baballang tikoloho le tse tšoarellang lefatšeng ka bophara.Schneider e na le mefuta e mengata ea li-valve tsa bolo ea motlakase ho fihlela litlhoko tsa liindasteri tsa hau tse fapaneng.